mercurial/help/config.txt

--- a/mercurial/help/config.txt	Mon Feb 06 23:22:04 2017 -0500
+++ b/mercurial/help/config.txt	Fri Feb 17 11:08:36 2017 +0100
@@ -277,7 +277,7 @@
 will let you do ``hg echo foo`` to have ``foo`` printed in your
 terminal. A better example might be::
 
-   purge = !$HG status --no-status --unknown -0 re: | xargs -0 rm
+   purge = !$HG status --no-status --unknown -0 re: | xargs -0 rm -f
 
 which will make ``hg purge`` delete all unknown files in the
 repository in the same manner as the purge extension.