diff --git a/sudo.man b/sudo.man
index 879e105e8..51cd14aca 100644
--- a/sudo.man
+++ b/sudo.man
@@ -174,6 +174,7 @@ Have visudo do more extensive checking on the sudoers file.
 .SH ENVIRONMENT VARIABLES
 .nf
 EDITOR                       Used by visudo to determine the editor to use.
+VISUAL                       Used by visudo if EDITOR is not set.
 .fi
 
 .SH AUTHORS