diff --git a/mergetools/vimdiff b/mergetools/vimdiff
index f770b8fe24..ea416adcaa 100644
--- a/mergetools/vimdiff
+++ b/mergetools/vimdiff
@@ -29,8 +29,8 @@
 ################################################################################
 
 debug_print () {
-	# Send message to stderr if global variable GIT_MERGETOOL_VIMDIFF is set
-	# to "true"
+	# Send message to stderr if global variable GIT_MERGETOOL_VIMDIFF_DEBUG
+	# is set.
 
 	if test -n "$GIT_MERGETOOL_VIMDIFF_DEBUG"
 	then