diff --git a/doc/developers/api_c_tests.rst b/doc/developers/api_c_tests.rst
index 164f8250441..74185c29ecf 100644
--- a/doc/developers/api_c_tests.rst
+++ b/doc/developers/api_c_tests.rst
@@ -37,3 +37,7 @@ Capabilities
 libltpswap
 ----------
 .. kernel-doc:: ../../include/libswap.h
+
+Temporary directory
+-------------------
+.. kernel-doc:: ../../include/tst_tmpdir.h