diff --git a/meta-ohos-core/recipes-core/images/allscenarios-image-base-tests.bb b/meta-ohos-core/recipes-core/images/allscenarios-image-base-tests.bb
index 651398a7330be4830a6ce9ea9fc2a553a8184237..3a0fce09ccd43f13a6446edb96e78e7a39452ebd 100644
--- a/meta-ohos-core/recipes-core/images/allscenarios-image-base-tests.bb
+++ b/meta-ohos-core/recipes-core/images/allscenarios-image-base-tests.bb
@@ -13,5 +13,6 @@ IMAGE_INSTALL_append = "\
 # This adds ptest packages to the image
 EXTRA_IMAGE_FEATURES_append = " ptest-pkgs"
 
-# For testing purposes we want the ability to have a writable filesystem
+# For testing purposes, we want to have an extra ext4 format for the root
+# filesystem.
 IMAGE_FSTYPES_append = " ext4"