diff --git a/indra/llui/llnotifications.h b/indra/llui/llnotifications.h
index 462d69be2e1b3bea6eb5339d0eca4d6371682e56..3df2efcac3a66b63d7dbb092091f84c377bccdf1 100644
--- a/indra/llui/llnotifications.h
+++ b/indra/llui/llnotifications.h
@@ -690,7 +690,7 @@ typedef std::multimap<std::string, LLNotificationPtr> LLNotificationMap;
 // Abstract base class (interface) for a channel; also used for the master container.
 // This lets us arrange channels into a call hierarchy.
 
-// We maintain a heirarchy of notification channels; events are always started at the top
+// We maintain a hierarchy of notification channels; events are always started at the top
 // and propagated through the hierarchy only if they pass a filter.
 // Any channel can be created with a parent. A null parent (empty string) means it's
 // tied to the root of the tree (the LLNotifications class itself).