diff --git a/AUTHORS.rst b/AUTHORS.rst
index bb118e4c7..b0e5c07da 100644
--- a/AUTHORS.rst
+++ b/AUTHORS.rst
@@ -28,6 +28,7 @@ The following wonderful people contributed directly or indirectly to this projec
 - `Avanatiker <https://github.com/Avanatiker>`_
 - `Balduro <https://github.com/Balduro>`_
 - `Bibo-Joshi <https://github.com/Bibo-Joshi>`_
+- `Biruk Alamirew <https://github.com/BAcode-X>`_
 - `bimmlerd <https://github.com/bimmlerd>`_
 - `cyc8 <https://github.com/cyc8>`_ 
 - `d-qoi <https://github.com/d-qoi>`_
diff --git a/telegram/constants.py b/telegram/constants.py
index 3c594fbe2..f5cd7b838 100644
--- a/telegram/constants.py
+++ b/telegram/constants.py
@@ -655,6 +655,8 @@ class MessageLimit(IntEnum):
     CAPTION_LENGTH = 1024
     """:obj:`int`: Maximum number of characters for a message caption."""
     # constants above this line are tested
+    DEEP_LINK_LENGTH = 64
+    """:obj:`int`: Maximum number of characters for a deep link."""
     MESSAGE_ENTITIES = 100
     """:obj:`int`: Maximum number of entities that can be displayed in a message. Further entities
     will simply be ignored by Telegram.