diff --git a/Documentation/driver-api/index.rst b/Documentation/driver-api/index.rst
index 1d8c5599149b..99bdb393f475 100644
--- a/Documentation/driver-api/index.rst
+++ b/Documentation/driver-api/index.rst
@@ -79,6 +79,7 @@ available subsections can be seen below.
    ipmb
    isa
    isapnp
+   io-mapping
    generic-counter
    lightnvm-pblk
    memory-devices/index
diff --git a/Documentation/io-mapping.txt b/Documentation/driver-api/io-mapping.rst
similarity index 100%
rename from Documentation/io-mapping.txt
rename to Documentation/driver-api/io-mapping.rst