diff --git a/documentation/dev-manual/runtime-testing.rst b/documentation/dev-manual/runtime-testing.rst
index a5d8502fbb..177f781b62 100644
--- a/documentation/dev-manual/runtime-testing.rst
+++ b/documentation/dev-manual/runtime-testing.rst
@@ -229,7 +229,7 @@ The final thing you need to do when setting :term:`TEST_TARGET` to
    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 @@ You can start the tests automatically or manually:
    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::
 
diff --git a/documentation/dev-manual/upgrading-recipes.rst b/documentation/dev-manual/upgrading-recipes.rst
index abcf7ca9fe..dc8e3c6f52 100644
--- a/documentation/dev-manual/upgrading-recipes.rst
+++ b/documentation/dev-manual/upgrading-recipes.rst
@@ -117,7 +117,7 @@ The following steps describe how to set up the AUH utility:
       class, which is optional, you need to have the following set in
       your ``conf/local.conf`` file::
 
-         INHERIT += "testimage"
+         IMAGE_CLASSES += "testimage"
 
       .. note::