diff --git a/Documentation/config.txt b/Documentation/config.txt
index ab26963d6..7c3f67237 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -1629,7 +1629,7 @@ interactive.singlekey::
 	linkgit:git-add[1], linkgit:git-checkout[1], linkgit:git-commit[1],
 	linkgit:git-reset[1], and linkgit:git-stash[1]. Note that this
 	setting is silently ignored if portable keystroke input
-	is not available.
+	is not available; requires the Perl module Term::ReadKey.
 
 log.abbrevCommit::
 	If true, makes linkgit:git-log[1], linkgit:git-show[1], and