diff --git a/Documentation/i2c/index.rst b/Documentation/i2c/index.rst
index 8a2ad3845191b3601be82253df3acf977ac480f2..8b76217e370aa6c46f14b8ddb2b2a6b63d447793 100644
--- a/Documentation/i2c/index.rst
+++ b/Documentation/i2c/index.rst
@@ -47,6 +47,7 @@ Slave I2C
 
    slave-interface
    slave-eeprom-backend
+   slave-testunit-backend
 
 Advanced topics
 ===============