dev-manual: clarify how to select "read-only-rootfs"

For stylistic reasons, clarify the use of both IMAGE_FEATURES versus
EXTRA_IMAGE_FEATURES when configuring a read-only rootfs.

(From yocto-docs rev: 4111e4e70a87400671455ddd873d802d40d6b587)

Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 9 insertions, 9 deletions

diff --git a/documentation/dev-manual/dev-manual-common-tasks.xml b/documentation/dev-manual/dev-manual-common-tasks.xml
index 2b8868b625..8bb8612e0f 100644
--- a/documentation/dev-manual/dev-manual-common-tasks.xml
+++ b/documentation/dev-manual/dev-manual-common-tasks.xml
@@ -11195,18 +11195,18 @@
 
             <para>
                 To create the read-only root filesystem, simply add the
-                "read-only-rootfs" feature to your image.
-                Using either of the following statements in your
-                image recipe or from within the
-                <filename>local.conf</filename> file found in the
-                <ulink url='&YOCTO_DOCS_REF_URL;#build-directory'>Build Directory</ulink>
-                causes the build system to create a read-only root filesystem:
+                "read-only-rootfs" feature to your image, normally in one of two ways.
+                The first way is to add the "read-only-rootfs" image feature
+                in the image's recipe file via the
+                <filename>IMAGE_FEATURES</filename> variable:
                 <literallayout class='monospaced'>
-     IMAGE_FEATURES = "read-only-rootfs"
+     IMAGE_FEATURES += "read-only-rootfs"
                 </literallayout>
-                or
+                As an alternative, you can add the same feature from within your
+                build directory's <filename>local.conf</filename> file with the
+                associated <filename>EXTRA_IMAGE_FEATURES</filename> variable, as in:
                 <literallayout class='monospaced'>
-     EXTRA_IMAGE_FEATURES += "read-only-rootfs"
+     EXTRA_IMAGE_FEATURES = "read-only-rootfs"
                 </literallayout>
             </para>