diff --git a/oauthenticator/cilogon.py b/oauthenticator/cilogon.py
index ea77d91d..39d942d8 100644
--- a/oauthenticator/cilogon.py
+++ b/oauthenticator/cilogon.py
@@ -314,7 +314,8 @@ def user_info_to_username(self, user_info):
 
     def _user_info_to_unprocessed_username(self, user_info):
         """
-        Returns a username from
+        Returns a username from user_info without also applying the "action"
+        specified under "username_derivation" for the associated idp.
         """
         user_idp = user_info["idp"]
         username_derivation = self.allowed_idps[user_idp]["username_derivation"]
@@ -330,8 +331,8 @@ def _user_info_to_unprocessed_username(self, user_info):
 
     def _get_processed_username(self, username, user_info):
         """
-        This method optionally adjusts a username from user_info based on the
-        "action" specified under "username_derivation" for the associated idp.
+        Optionally adjusts a username from user_info based on the "action"
+        specified under "username_derivation" for the associated idp.
         """
         user_idp = user_info["idp"]
         username_derivation = self.allowed_idps[user_idp]["username_derivation"]
diff --git a/oauthenticator/generic.py b/oauthenticator/generic.py
index 26be3ab8..445e5ea6 100644
--- a/oauthenticator/generic.py
+++ b/oauthenticator/generic.py
@@ -84,6 +84,11 @@ def _default_http_client(self):
         )
 
     def user_info_to_username(self, user_info):
+        """
+        Overrides OAuthenticator.user_info_to_username to support the
+        GenericOAuthenticator unique feature of allowing username_claim to be a
+        callable function.
+        """
         if callable(self.username_claim):
             username = self.username_claim(user_info)
         else: