diff --git a/Documentation/driver-api/driver-model/devres.rst b/Documentation/driver-api/driver-model/devres.rst
index 79c80ecf6a424a2ca1050f4f76ea71119cbc225a..dc1b2353cea3f730b99374ab31c5cf3e1a1d3692 100644
--- a/Documentation/driver-api/driver-model/devres.rst
+++ b/Documentation/driver-api/driver-model/devres.rst
@@ -301,6 +301,7 @@ IO region
   devm_release_region()
   devm_release_resource()
   devm_request_mem_region()
+  devm_request_free_mem_region()
   devm_request_region()
   devm_request_resource()