diff --git a/discord/message.py b/discord/message.py
index 820b3f924..21149f9d4 100644
--- a/discord/message.py
+++ b/discord/message.py
@@ -1121,6 +1121,11 @@ class PartialMessage(Hashable):
 
         Marks this message as read.
 
+        .. note::
+
+            This sets the last acknowledged message to this message,
+            which will mark acknowledged messages created after this one as unread.
+
         Parameters
         -----------
         manual: :class:`bool`