diff --git a/src/include/storage/sync.h b/src/include/storage/sync.h
index 124a49ea984..8efb68f8e01 100644
--- a/src/include/storage/sync.h
+++ b/src/include/storage/sync.h
@@ -29,8 +29,8 @@ typedef enum SyncRequestType
 } SyncRequestType;
 
 /*
- * Which set of functions to use to handle a given request.  See the function
- * table in sync.c.
+ * Which set of functions to use to handle a given request.  The values of
+ * the enumerators must match the indexes of the function table in sync.c.
  */
 typedef enum SyncRequestHandler
 {