diff --git a/Types-of-Handlers.md b/Types-of-Handlers.md
index 3e622c2..55bebeb 100644
--- a/Types-of-Handlers.md
+++ b/Types-of-Handlers.md
@@ -35,6 +35,10 @@ Clicking this link will open your Telegram Client and show a big START button. W
 
 Note that since telegram doesn't support spaces in deep linking parameters, you will have to manually split the single `Hello_World` argument, into `["Hello", "World!"]` (using `args[0].split('_')` for example)
 
+You also have to pay attention to the maximum lenght accepted by Telegram itself. As stated in the [documentation](https://core.telegram.org/bots#deep-linking) the maximum lenght for the start parameter is 64.
+
+Also, since this is an URL parameter, you have to pay attention on how to correctly pass the values in order to  avoid passing URL reserved characters. Consier the usage of `base64.urlsafe_b64encode`.
+
 ## Pattern matching: The RegexHandler
 
 For more complex inputs you can employ the [telegram.ext.RegexHandler](https://python-telegram-bot.readthedocs.io/en/latest/telegram.ext.regexhandler.html), which internally uses the `re`-module to match textual user input with a supplied pattern.