diff --git a/libc/docs/ctype.rst b/libc/docs/ctype.rst
index c2897e0c58dc1d..7d77dadccc9ba3 100644
--- a/libc/docs/ctype.rst
+++ b/libc/docs/ctype.rst
@@ -1,3 +1,5 @@
+.. include:: check.rst
+
 ctype.h Functions
 =================