diff --git a/Documentation/core-api/idr.rst b/Documentation/core-api/idr.rst
index 9078a5c3ac95503865b9821de7d702bb5692fbe3..d351e880a2f6cf156f41a5ee4a3e330dfb7a6f0f 100644
--- a/Documentation/core-api/idr.rst
+++ b/Documentation/core-api/idr.rst
@@ -76,4 +76,6 @@ Functions and structures
 ========================
 
 .. kernel-doc:: include/linux/idr.h
+   :functions:
 .. kernel-doc:: lib/idr.c
+   :functions: