diff --git a/synapse/handlers/profile.py b/synapse/handlers/profile.py
index f937dc1a23..6b7a5dc7fd 100644
--- a/synapse/handlers/profile.py
+++ b/synapse/handlers/profile.py
@@ -261,6 +261,8 @@ class ProfileHandler:
           updates into rooms, which could cause rooms to be accidentally joined
           after the deactivated user has left them.
 
+          FIXME: This precondition seems to lack a test.
+
         Args:
             target_user: the user whose displayname is to be changed.
             requester: The user attempting to make this change.
@@ -385,6 +387,8 @@ class ProfileHandler:
           updates into rooms, which could cause rooms to be accidentally joined
           after the deactivated user has left them.
 
+          FIXME: This precondition seems to lack a test.
+
         Args:
             target_user: the user whose avatar URL is to be changed.
             requester: The user attempting to make this change.
@@ -829,6 +833,8 @@ class ProfileHandler:
           notify modules about the change whilst claiming it is not related
           to user deactivation.
 
+          FIXME: This precondition seems to lack a test.
+
         Args:
             target_user: the user whose profile is to be changed.
             requester: The user attempting to make this change.
@@ -914,6 +920,8 @@ class ProfileHandler:
           notify modules about the change whilst claiming it is not related
           to user deactivation.
 
+          FIXME: This precondition seems to lack a test.
+
         Args:
             target_user: the user whose profile is to be changed.
             requester: The user attempting to make this change.