diff --git a/hgext/extdiff.py b/hgext/extdiff.py
--- a/hgext/extdiff.py
+++ b/hgext/extdiff.py
@@ -23,9 +23,6 @@ you do not need to type :hg:`extdiff -p 
   #cmd.cdiff = gdiff
   #opts.cdiff = -Nprc5
 
-  # add new command called vdiff, runs kdiff3
-  vdiff = kdiff3
-
   # add new command called meld, runs meld (no need to name twice).  If
   # the meld executable is not available, the meld tool in [merge-tools]
   # will be used, if available
diff --git a/tests/test-extension.t b/tests/test-extension.t
--- a/tests/test-extension.t
+++ b/tests/test-extension.t
@@ -424,9 +424,6 @@ Extension module help vs command help:
     #cmd.cdiff = gdiff
     #opts.cdiff = -Nprc5
   
-    # add new command called vdiff, runs kdiff3
-    vdiff = kdiff3
-  
     # add new command called meld, runs meld (no need to name twice).  If
     # the meld executable is not available, the meld tool in [merge-tools]
     # will be used, if available