1 files changed, 10 insertions, 0 deletions
diff --git a/sql/rpl_rli.h b/sql/rpl_rli.h
index bf8381933c0..09b58d4f3a0 100644
--- a/sql/rpl_rli.h
+++ b/sql/rpl_rli.h
@@ -97,6 +97,16 @@ public:
   */
   MYSQL_BIN_LOG relay_log;
   LOG_INFO linfo;
+
+  /*
+   cur_log
+     Pointer that either points at relay_log.get_log_file() or
+     &rli->cache_buf, depending on whether the log is hot or there was
+     the need to open a cold relay_log.
+
+   cache_buf 
+     IO_CACHE used when opening cold relay logs.
+   */
   IO_CACHE cache_buf,*cur_log;
 
   /*