diff --git a/cgi/README b/cgi/README
new file mode 100644
index 00000000..d32473b0
--- /dev/null
+++ b/cgi/README
@@ -0,0 +1,3 @@
+For the HTML files in the lconline directory to work, your web server
+must have mod_negotiation enabled.
+Or you can just remove the .XY suffixes from the language-specific files.