diff --git a/poky/documentation/dev-manual/runtime-testing.rst b/poky/documentation/dev-manual/runtime-testing.rst
index c5c5653..af3fe2c 100644
--- a/poky/documentation/dev-manual/runtime-testing.rst
+++ b/poky/documentation/dev-manual/runtime-testing.rst
@@ -229,7 +229,7 @@
    statements in your ``local.conf`` file::
 
       IMAGE_FSTYPES += "tar.gz"
-      INHERIT += "testimage"
+      IMAGE_CLASSES += "testimage"
       TEST_TARGET = "SystemdbootTarget"
       TEST_TARGET_IP = "192.168.2.3"
 
@@ -335,7 +335,7 @@
    inherit the :ref:`ref-classes-testimage` class by editing your
    ``local.conf`` file::
 
-      INHERIT += "testimage"
+      IMAGE_CLASSES += "testimage"
 
    Next, use BitBake to run the tests::