diff --git a/man2/request_key.2 b/man2/request_key.2
index 9817f7f3b..a62b22a7e 100644
--- a/man2/request_key.2
+++ b/man2/request_key.2
@@ -139,3 +139,8 @@ should be specified to the linker.
 .BR keyctl (3),
 .BR keyrings (7),
 .BR request-key (8)
+
+The kernel source files
+.IR Documentation/security/keys.txt
+and
+.IR Documentation/security/keys-request-key.txt .