diff --git a/Source/externs.m b/Source/externs.m
index 738f8eab3..4b5a5ece9 100644
--- a/Source/externs.m
+++ b/Source/externs.m
@@ -144,6 +144,16 @@ NSString *NSControlTextDidChangeNotification =
 // NSDataLink global strings
 NSString *NSDataLinkFileNameExtension = @"dlf";
 
+// NSDrawer notifications
+NSString *NSDrawerDidCloseNotification =
+@"NSDrawerDidCloseNotification";
+NSString *NSDrawerDidOpenNotification =
+@"NSDrawerDidOpenNotification";
+NSString *NSDrawerWillCloseNotification =
+@"NSDrawerWillCloseNotification";
+NSString *NSDrawerWillOpenNotification =
+@"NSDrawerWillOpenNotification";
+
 // NSForm private notification
 NSString *_NSFormCellDidChangeTitleWidthNotification 
 = @"_NSFormCellDidChangeTitleWidthNotification";