mercurial/commands.py

--- a/mercurial/commands.py	Tue Nov 27 14:58:00 2012 -0800
+++ b/mercurial/commands.py	Fri Nov 23 11:59:44 2012 -0500
@@ -549,6 +549,10 @@
           hg bisect --skip
           hg bisect --skip 23
 
+      - skip all revisions that do not touch directories ``foo`` or ``bar``
+
+          hg bisect --skip '!( file("path:foo") & file("path:bar") )'
+
       - forget the current bisection::
 
           hg bisect --reset