diff --git a/contrib/long-running-filter/example.pl b/contrib/long-running-filter/example.pl
index a677569ddd..4b83e4c5e8 100755
--- a/contrib/long-running-filter/example.pl
+++ b/contrib/long-running-filter/example.pl
@@ -1,7 +1,7 @@
 #!/usr/bin/perl
 #
 # Example implementation for the Git filter protocol version 2
-# See Documentation/gitattributes.txt, section "Filter Protocol"
+# See Documentation/gitattributes.adoc, section "Filter Protocol"
 #
 # Please note, this pass-thru filter is a minimal skeleton. No proper
 # error handling was implemented.