diff --git a/litellm/proxy/proxy_server.py b/litellm/proxy/proxy_server.py
index da040f5caa2..b713eca2eee 100644
--- a/litellm/proxy/proxy_server.py
+++ b/litellm/proxy/proxy_server.py
@@ -3020,7 +3020,7 @@ class ProxyConfig:
             if user_api_key_cache_ttl is not None:
                 user_api_key_cache.update_cache_ttl(
                     default_in_memory_ttl=float(user_api_key_cache_ttl),
-                    default_redis_ttl=None,  # PKCE verifiers set explicit TTL on each store; Redis TTL not configured here
+                    default_redis_ttl=None,  # user_api_key_cache uses in-memory TTL only; Redis not configured for key lookups
                 )
 
             ### PKCE MULTI-INSTANCE PREREQUISITE CHECK ###