--- a/QScintilla/Lexers/LexerPostScript.py	Sun Mar 17 14:12:00 2019 +0100
+++ b/QScintilla/Lexers/LexerPostScript.py	Sun Mar 17 18:43:46 2019 +0100
@@ -29,6 +29,14 @@
         Lexer.__init__(self)
         
         self.commentString = "%"
+        
+        self.keywordSetDescriptions = [
+            self.tr("PS Level 1 operators"),
+            self.tr("PS Level 2 operators"),
+            self.tr("PS Level 3 operators"),
+            self.tr("RIP specific operators"),
+            self.tr("User defined operators"),
+        ]
     
     def initProperties(self):
         """