1 files changed, 2 insertions, 0 deletions

diff --git a/linden/indra/llcommon/llevent.h b/linden/indra/llcommon/llevent.h
index c48817e..bcb6ee9 100644
--- a/linden/indra/llcommon/llevent.h
+++ b/linden/indra/llcommon/llevent.h
@@ -31,6 +31,7 @@
 
 #include "llsd.h"
 #include "llmemory.h"
+#include "llthread.h"
 
 class LLEventListener;
 class LLEvent;
@@ -128,6 +129,7 @@ public:
 
         // Adds a listener to this dispatcher, with a given user data
         // that will be passed to the listener when an event is fired.
+        // Duplicate pointers are removed on addtion.
         void addListener(LLEventListener *listener, LLSD filter, const LLSD& userdata);
 
         // Removes a listener from this dispatcher