1 files changed, 2 insertions, 0 deletions
diff --git a/main.h b/main.h
index 088e2860c3..5934350f22 100644
--- a/main.h
+++ b/main.h
@@ -1733,6 +1733,8 @@ public:
 
 
 //
+// Alerts are for notifying old versions if they become too obsolete and
+// need to upgrade.  The message is displayed in the status bar.
 // Alert messages are broadcast as a vector of signed data.  Unserializing may
 // not read the entire buffer if the alert is for a newer version, but older
 // versions can still relay the original data.