--- a/Tools__NewSystemBrowser.st	Sun Aug 09 06:38:26 2015 +0200
+++ b/Tools__NewSystemBrowser.st	Sat Aug 15 06:39:43 2015 +0200
@@ -36035,7 +36035,7 @@
     tempStream nextPutLine:('"/ first, a guard, to ignore the patch if the library already contains an up-to-date class:').
     tempStream nextPutLine:('"/').
     changedOwningClasses do:[:eachClass |
-        tempStream nextPutLine:('(Smalltalk classNamed:''%2'') isNil ifTrue:[InvalidPatchError raiseErrorString:''patch is for non-existant class %2 (probably for a plugin that is not installed)'']. 
+        tempStream nextPutLine:('(Smalltalk classNamed:''%2'') isNil ifTrue:[InvalidPatchError raiseErrorString:''patch is for non-existent class %2 (probably for a plugin that is not installed)'']. 
 (''%1'' compareAsVersionNumberWith:%2 revision) < 0 ifTrue:[ InvalidPatchError raiseErrorString:''patch is for older version (%1) of class %2'' ].'
                             bindWith:eachClass revision
                             with:eachClass name).