documentation: improve LIC_FILES_CHKSUM documentation

Document that LIC_FILES_CHKSUM is mandatory, when gets validated, and
improve some wording.

(From yocto-docs rev: ca878d7b0c84812ef29bbaf5894c96dd89500ec9)

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 5 insertions, 5 deletions

diff --git a/documentation/poky-ref-manual/ref-variables.xml b/documentation/poky-ref-manual/ref-variables.xml
index 81dbf0c1ca..3dd9183bcf 100644
--- a/documentation/poky-ref-manual/ref-variables.xml
+++ b/documentation/poky-ref-manual/ref-variables.xml
@@ -562,12 +562,12 @@
                 <para>Checksums of the license text in the recipe source code.</para>
                 <para>This variable tracks changes in license text of the source
                     code files. 
-                    If the license text is changed, it will trigger the build
+                    If the license text is changed, it will trigger a build
                     failure, which gives the developer an opportunity to review any 
-                    license change</para>
-                <para> 
-                    Currently, this variable is optional.
-                    The plan is to make it a required variable in the future.</para>
+                    license change.</para>
+                <para>
+                    This variable must be defined for all recipes (unless LICENSE
+                    is set to "CLOSED")</para>
                 <para>For more information, see the
                     <link linkend='usingpoky-configuring-LIC_FILES_CHKSUM'>
                     Track License Change</link> section</para>