diff --git a/src/php/ext/grpc/call_credentials.c b/src/php/ext/grpc/call_credentials.c
index c6f674edd9e8409d8d75985b21c403d117b5ec30..06c6fc0566a3394eb7726b978c6de052bff1748a 100644
--- a/src/php/ext/grpc/call_credentials.c
+++ b/src/php/ext/grpc/call_credentials.c
@@ -185,7 +185,6 @@ void plugin_get_metadata(void *ptr, grpc_auth_metadata_context context,
   MAKE_STD_ZVAL(arg);
   ZVAL_STRING(arg, context.service_url, 1);
   params[0] = &arg;
-  /* TODO: Need to pass user_data as well? */
   state->fci->param_count = 1;
   state->fci->params = params;
   state->fci->retval_ptr_ptr = &retval;