diff --git a/chapter4/searchengine.py b/chapter4/searchengine.py
index b88a018..1b99b62 100755
--- a/chapter4/searchengine.py
+++ b/chapter4/searchengine.py
@@ -80,7 +80,7 @@ def isindexed(self,url):
   
   # Add a link between two pages
   def addlinkref(self,urlFrom,urlTo,linkText):
-    words=self.separateWords(linkText)
+    words=self.separatewords(linkText)
     fromid=self.getentryid('urllist','url',urlFrom)
     toid=self.getentryid('urllist','url',urlTo)
     if fromid==toid: return