diff --git a/changelog.d/15922.misc b/changelog.d/15922.misc
new file mode 100644
index 000000000000..93fc64487759
--- /dev/null
+++ b/changelog.d/15922.misc
@@ -0,0 +1 @@
+Add details to warning in log when we fail to fetch an alias.
diff --git a/synapse/handlers/directory.py b/synapse/handlers/directory.py
index 1e0623c7f87f..623a4e7b1d5d 100644
--- a/synapse/handlers/directory.py
+++ b/synapse/handlers/directory.py
@@ -277,7 +277,9 @@ async def get_association(self, room_alias: RoomAlias) -> JsonDict:
             except RequestSendFailed:
                 raise SynapseError(502, "Failed to fetch alias")
             except CodeMessageException as e:
-                logging.warning("Error retrieving alias")
+                logging.warning(
+                    "Error retrieving alias %s -> %s %s", room_alias, e.code, e.msg
+                )
                 if e.code == 404:
                     fed_result = None
                 else: