diff --git a/SpecialCite.php b/SpecialCite.php
new file mode 100644
index 000000000..dc530259d
--- /dev/null
+++ b/SpecialCite.php
@@ -0,0 +1,7 @@
+<?php
+
+trigger_error(
+	'Special:Cite was moved to a separate CiteThisPage extension, ' .
+	'see <https://www.mediawiki.org/wiki/Extension:CiteThisPage> for information on how to install it',
+	E_USER_WARNING
+);