diff --git a/docs/api.rst b/docs/api.rst
index 0c4b021bc..ac9c489cc 100644
--- a/docs/api.rst
+++ b/docs/api.rst
@@ -716,7 +716,8 @@ Enumerations
 The API provides some enumerations for certain types of strings to avoid the API
 from being stringly typed in case the strings change in the future.
 
-All enumerations are subclasses of :class:`enum.Enum`.
+All enumerations are subclasses of an internal class which mimics the behaviour
+of :class:`enum.Enum`.
 
 .. class:: ChannelType