diff --git a/src/errors.rs b/src/errors.rs
index 7d271042..dc3ff738 100644
--- a/src/errors.rs
+++ b/src/errors.rs
@@ -1,6 +1,7 @@
 use reqwest::StatusCode;
 
 //<editor-fold desc="download">
+/// An error occurred after downloading a file.
 #[derive(Debug, Error, From)]
 pub enum DownloadError {
     #[error("A network error: {0}")]
@@ -13,6 +14,7 @@ pub enum DownloadError {
 //</editor-fold>
 
 //<editor-fold desc="request">
+/// An error occurred after making a request to Telegram.
 #[derive(Debug, Error)]
 pub enum RequestError {
     #[error("A Telegram's error #{status_code}: {kind:?}")]
@@ -27,7 +29,7 @@ pub enum RequestError {
     MigrateToChatId(i64),
 
     /// In case of exceeding flood control, the number of seconds left to wait
-    /// before the request can be repeated
+    /// before the request can be repeated.
     #[error("Retry after {0} seconds")]
     RetryAfter(i32),
 
@@ -40,13 +42,14 @@ pub enum RequestError {
 
 //</editor-fold>
 
+/// A kind of an API error returned from Telegram.
 #[derive(Debug, Deserialize, PartialEq, Copy, Hash, Eq, Clone)]
 pub enum ApiErrorKind {
     /// Occurs when the bot tries to send message to user who blocked the bot.
     #[serde(rename = "Forbidden: bot was blocked by the user")]
     BotBlocked,
 
-    /// Occurs when bot tries to modify a message without modification content
+    /// Occurs when bot tries to modify a message without modification content.
     ///
     /// May happen in methods:
     /// 1. [`EditMessageText`]
@@ -57,7 +60,7 @@ pub enum ApiErrorKind {
                       as a current content and reply markup of the message")]
     MessageNotModified,
 
-    /// Occurs when bot tries to forward or delete a message which was deleted
+    /// Occurs when bot tries to forward or delete a message which was deleted.
     ///
     /// May happen in methods:
     /// 1. [`ForwardMessage`]
@@ -68,7 +71,7 @@ pub enum ApiErrorKind {
     #[serde(rename = "Bad Request: MESSAGE_ID_INVALID")]
     MessageIdInvalid,
 
-    /// Occurs when bot tries to forward a message which does not exists
+    /// Occurs when bot tries to forward a message which does not exists.
     ///
     /// May happen in methods:
     /// 1. [`ForwardMessage`]
@@ -77,7 +80,7 @@ pub enum ApiErrorKind {
     #[serde(rename = "Bad Request: message to forward not found")]
     MessageToForwardNotFound,
 
-    /// Occurs when bot tries to delete a message which does not exists
+    /// Occurs when bot tries to delete a message which does not exists.
     ///
     /// May happen in methods:
     /// 1. [`DeleteMessage`]
@@ -86,7 +89,7 @@ pub enum ApiErrorKind {
     #[serde(rename = "Bad Request: message to delete not found")]
     MessageToDeleteNotFound,
 
-    /// Occurs when bot tries to send a text message without text
+    /// Occurs when bot tries to send a text message without text.
     ///
     /// May happen in methods:
     /// 1. [`SendMessage`]
@@ -95,7 +98,7 @@ pub enum ApiErrorKind {
     #[serde(rename = "Bad Request: message text is empty")]
     MessageTextIsEmpty,
 
-    /// Occurs when bot tries to edit a message after long time
+    /// Occurs when bot tries to edit a message after long time.
     ///
     /// May happen in methods:
     /// 1. [`EditMessageText`]
@@ -105,7 +108,7 @@ pub enum ApiErrorKind {
     MessageCantBeEdited,
 
     /// Occurs when bot tries to delete a someone else's message in group where
-    /// it does not have enough rights
+    /// it does not have enough rights.
     ///
     /// May happen in methods:
     /// 1. [`DeleteMessage`]
@@ -114,7 +117,7 @@ pub enum ApiErrorKind {
     #[serde(rename = "Bad Request: message can't be deleted")]
     MessageCantBeDeleted,
 
-    /// Occurs when bot tries to edit a message which does not exists
+    /// Occurs when bot tries to edit a message which does not exists.
     ///
     /// May happen in methods:
     /// 1. [`EditMessageText`]
@@ -123,7 +126,7 @@ pub enum ApiErrorKind {
     #[serde(rename = "Bad Request: message to edit not found")]
     MessageToEditNotFound,
 
-    /// Occurs when bot tries to reply to a message which does not exists
+    /// Occurs when bot tries to reply to a message which does not exists.
     ///
     /// May happen in methods:
     /// 1. [`SendMessage`]
@@ -137,7 +140,7 @@ pub enum ApiErrorKind {
     MessageIdentifierNotSpecified,
 
     /// Occurs when bot tries to send a message with text size greater then
-    /// 4096 symbols
+    /// 4096 symbols.
     ///
     /// May happen in methods:
     /// 1. [`SendMessage`]
@@ -146,7 +149,7 @@ pub enum ApiErrorKind {
     #[serde(rename = "Bad Request: message is too long")]
     MessageIsTooLong,
 
-    /// Occurs when bot tries to send media group with more than 10 items
+    /// Occurs when bot tries to send media group with more than 10 items.
     ///
     /// May happen in methods:
     /// 1. [`SendMediaGroup`]
@@ -155,7 +158,7 @@ pub enum ApiErrorKind {
     #[serde(rename = "Bad Request: Too much messages to send as an album")]
     ToMuchMessages,
 
-    /// Occurs when bot tries to stop poll that has already been stopped
+    /// Occurs when bot tries to stop poll that has already been stopped.
     ///
     /// May happen in methods:
     /// 1. [`SendPoll`]
@@ -164,7 +167,7 @@ pub enum ApiErrorKind {
     #[serde(rename = "Bad Request: poll has already been closed")]
     PollHasAlreadyClosed,
 
-    /// Occurs when bot tries to send poll with less than 2 options
+    /// Occurs when bot tries to send poll with less than 2 options.
     ///
     /// May happen in methods:
     /// 1. [`SendPoll`]
@@ -173,7 +176,7 @@ pub enum ApiErrorKind {
     #[serde(rename = "Bad Request: poll must have at least 2 option")]
     PollMustHaveMoreOptions,
 
-    /// Occurs when bot tries to send poll with more than 10 options
+    /// Occurs when bot tries to send poll with more than 10 options.
     ///
     /// May happen in methods:
     /// 1. [`SendPoll`]
@@ -182,7 +185,7 @@ pub enum ApiErrorKind {
     #[serde(rename = "Bad Request: poll can't have more than 10 options")]
     PollCantHaveMoreOptions,
 
-    /// Occurs when bot tries to send poll with empty option (without text)
+    /// Occurs when bot tries to send poll with empty option (without text).
     ///
     /// May happen in methods:
     /// 1. [`SendPoll`]
@@ -191,7 +194,7 @@ pub enum ApiErrorKind {
     #[serde(rename = "Bad Request: poll options must be non-empty")]
     PollOptionsMustBeNonEmpty,
 
-    /// Occurs when bot tries to send poll with empty question (without text)
+    /// Occurs when bot tries to send poll with empty question (without text).
     ///
     /// May happen in methods:
     /// 1. [`SendPoll`]
@@ -201,7 +204,7 @@ pub enum ApiErrorKind {
     PollQuestionMustBeNonEmpty,
 
     /// Occurs when bot tries to send poll with total size of options more than
-    /// 100 symbols
+    /// 100 symbols.
     ///
     /// May happen in methods:
     /// 1. [`SendPoll`]
@@ -211,7 +214,7 @@ pub enum ApiErrorKind {
     PollOptionsLengthTooLong,
 
     /// Occurs when bot tries to send poll with question size more than 255
-    /// symbols
+    /// symbols.
     ///
     /// May happen in methods:
     /// 1. [`SendPoll`]
@@ -220,7 +223,7 @@ pub enum ApiErrorKind {
     #[serde(rename = "Bad Request: poll question length must not exceed 255")]
     PollQuestionLengthTooLong,
 
-    /// Occurs when bot tries to stop poll with message without poll
+    /// Occurs when bot tries to stop poll with message without poll.
     ///
     /// May happen in methods:
     /// 1. [`StopPoll`]
@@ -229,7 +232,7 @@ pub enum ApiErrorKind {
     #[serde(rename = "Bad Request: message with poll to stop not found")]
     MessageWithPollNotFound,
 
-    /// Occurs when bot tries to stop poll with message without poll
+    /// Occurs when bot tries to stop poll with message without poll.
     ///
     /// May happen in methods:
     /// 1. [`StopPoll`]
@@ -239,7 +242,7 @@ pub enum ApiErrorKind {
     MessageIsNotAPoll,
 
     /// Occurs when bot tries to send a message to chat in which it is not a
-    /// member
+    /// member.
     ///
     /// May happen in methods:
     /// 1. [`SendMessage`]
@@ -248,7 +251,7 @@ pub enum ApiErrorKind {
     #[serde(rename = "Bad Request: chat not found")]
     ChatNotFound,
 
-    /// Occurs when bot tries to send method with unknown user_id
+    /// Occurs when bot tries to send method with unknown user_id.
     ///
     /// May happen in methods:
     /// 1. [`getUserProfilePhotos`]
@@ -259,7 +262,7 @@ pub enum ApiErrorKind {
     UserNotFound,
 
     /// Occurs when bot tries to send [`SetChatDescription`] with same text as
-    /// in the current description
+    /// in the current description.
     ///
     /// May happen in methods:
     /// 1. [`SetChatDescription`]
@@ -268,7 +271,7 @@ pub enum ApiErrorKind {
     #[serde(rename = "Bad Request: chat description is not modified")]
     ChatDescriptionIsNotModified,
 
-    /// Occurs when bot tries to answer to query after timeout expire
+    /// Occurs when bot tries to answer to query after timeout expire.
     ///
     /// May happen in methods:
     /// 1. [`AnswerCallbackQuery`]
@@ -279,7 +282,7 @@ pub enum ApiErrorKind {
     InvalidQueryID,
 
     /// Occurs when bot tries to send InlineKeyboardMarkup with invalid button
-    /// url
+    /// url.
     ///
     /// May happen in methods:
     /// 1. [`SendMessage`]
@@ -288,7 +291,7 @@ pub enum ApiErrorKind {
     #[serde(rename = "Bad Request: BUTTON_URL_INVALID")]
     ButtonURLInvalid,
 
-    /// Occurs when bot tries to send button with data size more than 64 bytes
+    /// Occurs when bot tries to send button with data size more than 64 bytes.
     ///
     /// May happen in methods:
     /// 1. [`SendMessage`]
@@ -297,7 +300,7 @@ pub enum ApiErrorKind {
     #[serde(rename = "Bad Request: BUTTON_DATA_INVALID")]
     ButtonDataInvalid,
 
-    /// Occurs when bot tries to send button with data size == 0
+    /// Occurs when bot tries to send button with data size == 0.
     ///
     /// May happen in methods:
     /// 1. [`SendMessage`]
@@ -307,7 +310,7 @@ pub enum ApiErrorKind {
                       buttons are unallowed in the inline keyboard")]
     TextButtonsAreUnallowed,
 
-    /// Occurs when bot tries to get file by wrong file id
+    /// Occurs when bot tries to get file by wrong file id.
     ///
     /// May happen in methods:
     /// 1. [`GetFile`]
@@ -316,7 +319,7 @@ pub enum ApiErrorKind {
     #[serde(rename = "Bad Request: wrong file id")]
     WrongFileID,
 
-    /// Occurs when bot tries to do some with group which was deactivated
+    /// Occurs when bot tries to do some with group which was deactivated.
     #[serde(rename = "Bad Request: group is deactivated")]
     GroupDeactivated,
 
@@ -329,7 +332,7 @@ pub enum ApiErrorKind {
     #[serde(rename = "Bad Request: Photo should be uploaded as an InputFile")]
     PhotoAsInputFileRequired,
 
-    /// Occurs when bot tries to add sticker to stickerset by invalid name
+    /// Occurs when bot tries to add sticker to stickerset by invalid name.
     ///
     /// May happen in methods:
     /// 1. [`AddStickerToSet`]
@@ -339,7 +342,7 @@ pub enum ApiErrorKind {
     InvalidStickersSet,
 
     /// Occurs when bot tries to pin a message without rights to pin in this
-    /// chat
+    /// chat.
     ///
     /// May happen in methods:
     /// 1. [`PinMessage`]
@@ -349,12 +352,12 @@ pub enum ApiErrorKind {
     NotEnoughRightsToPinMessage,
 
     /// Occurs when bot tries to use method in group which is allowed only in a
-    /// supergroup or channel
+    /// supergroup or channel.
     #[serde(rename = "Bad Request: method is available only for supergroups \
                       and channel")]
     MethodNotAvailableInPrivateChats,
 
-    /// Occurs when bot tries to demote chat creator
+    /// Occurs when bot tries to demote chat creator.
     ///
     /// May happen in methods:
     /// 1. [`PromoteChatMember`]
@@ -363,7 +366,7 @@ pub enum ApiErrorKind {
     #[serde(rename = "Bad Request: can't demote chat creator")]
     CantDemoteChatCreator,
 
-    /// Occurs when bot tries to restrict self in group chats
+    /// Occurs when bot tries to restrict self in group chats.
     ///
     /// May happen in methods:
     /// 1. [`RestrictChatMember`]
@@ -373,7 +376,7 @@ pub enum ApiErrorKind {
     CantRestrictSelf,
 
     /// Occurs when bot tries to restrict chat member without rights to
-    /// restrict in this chat
+    /// restrict in this chat.
     ///
     /// May happen in methods:
     /// 1. [`RestrictChatMember`]
@@ -383,7 +386,7 @@ pub enum ApiErrorKind {
                       chat member")]
     NotEnoughRightsToRestrict,
 
-    /// Occurs when bot tries set webhook to protocol other than HTTPS
+    /// Occurs when bot tries set webhook to protocol other than HTTPS.
     ///
     /// May happen in methods:
     /// 1. [`SetWebhook`]
@@ -394,7 +397,7 @@ pub enum ApiErrorKind {
     WebhookRequireHTTPS,
 
     /// Occurs when bot tries to set webhook to port other than 80, 88, 443 or
-    /// 8443
+    /// 8443.
     ///
     /// May happen in methods:
     /// 1. [`SetWebhook`]
@@ -404,7 +407,7 @@ pub enum ApiErrorKind {
                       on ports 80, 88, 443 or 8443")]
     BadWebhookPort,
 
-    /// Occurs when bot tries to set webhook to unknown host
+    /// Occurs when bot tries to set webhook to unknown host.
     ///
     /// May happen in methods:
     /// 1. [`SetWebhook`]
@@ -414,7 +417,7 @@ pub enum ApiErrorKind {
                       Name or service not known")]
     UnknownHost,
 
-    /// Occurs when bot tries to set webhook to invalid URL
+    /// Occurs when bot tries to set webhook to invalid URL.
     ///
     /// May happen in methods:
     /// 1. [`SetWebhook`]
@@ -423,7 +426,7 @@ pub enum ApiErrorKind {
     #[serde(rename = "Bad Request: can't parse URL")]
     CantParseUrl,
 
-    /// Occurs when bot tries to send message with unfinished entities
+    /// Occurs when bot tries to send message with unfinished entities.
     ///
     /// May happen in methods:
     /// 1. [`SendMessage`]
@@ -432,7 +435,7 @@ pub enum ApiErrorKind {
     #[serde(rename = "Bad Request: can't parse entities")]
     CantParseEntities,
 
-    /// Occurs when bot tries to use getUpdates while webhook is active
+    /// Occurs when bot tries to use getUpdates while webhook is active.
     ///
     /// May happen in methods:
     /// 1. [`GetUpdates`]
@@ -441,7 +444,7 @@ pub enum ApiErrorKind {
     #[serde(rename = "can't use getUpdates method while webhook is active")]
     CantGetUpdates,
 
-    /// Occurs when bot tries to do some in group where bot was kicked
+    /// Occurs when bot tries to do some in group where bot was kicked.
     ///
     /// May happen in methods:
     /// 1. [`SendMessage`]
@@ -450,7 +453,7 @@ pub enum ApiErrorKind {
     #[serde(rename = "Unauthorized: bot was kicked from a chat")]
     BotKicked,
 
-    /// Occurs when bot tries to send message to deactivated user
+    /// Occurs when bot tries to send message to deactivated user.
     ///
     /// May happen in methods:
     /// 1. [`SendMessage`]
@@ -459,7 +462,7 @@ pub enum ApiErrorKind {
     #[serde(rename = "Unauthorized: user is deactivated")]
     UserDeactivated,
 
-    /// Occurs when you tries to initiate conversation with a user
+    /// Occurs when you tries to initiate conversation with a user.
     ///
     /// May happen in methods:
     /// 1. [`SendMessage`]
@@ -470,7 +473,7 @@ pub enum ApiErrorKind {
     )]
     CantInitiateConversation,
 
-    /// Occurs when you tries to send message to bot
+    /// Occurs when you tries to send message to bot.
     ///
     /// May happen in methods:
     /// 1. [`SendMessage`]
@@ -479,7 +482,7 @@ pub enum ApiErrorKind {
     #[serde(rename = "Unauthorized: bot can't send messages to bots")]
     CantTalkWithBots,
 
-    /// Occurs when bot tries to send button with invalid http url
+    /// Occurs when bot tries to send button with invalid http url.
     ///
     /// May happen in methods:
     /// 1. [`SendMessage`]
@@ -488,8 +491,8 @@ pub enum ApiErrorKind {
     #[serde(rename = "Bad Request: wrong HTTP URL")]
     WrongHTTPurl,
 
-    /// Occurs when bot tries GetUpdate before the timeout.
-    /// Make sure that only one Updater is running.
+    /// Occurs when bot tries GetUpdate before the timeout. Make sure that only
+    /// one Updater is running.
     ///
     /// May happen in methods:
     /// 1. [`GetUpdates`]
@@ -499,7 +502,7 @@ pub enum ApiErrorKind {
                       make sure that only one bot instance is running")]
     TerminatedByOtherGetUpdates,
 
-    /// Occurs when bot tries to get file by invalid file id
+    /// Occurs when bot tries to get file by invalid file id.
     ///
     /// May happen in methods:
     /// 1. [`GetFile`]