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diff --git a/documentation/ref-manual/ref-structure.xml b/documentation/ref-manual/ref-structure.xml
index e0209c1afa..be292eb136 100644
--- a/documentation/ref-manual/ref-structure.xml
+++ b/documentation/ref-manual/ref-structure.xml
@@ -659,6 +659,22 @@
659 </para> 659 </para>
660 </section> 660 </section>
661 661
662 <section id='structure-build-tmp-sstate-control'>
663 <title><filename>build/tmp/sstate-control/</filename></title>
664
665 <para>
666 The OpenEmbedded build system uses this directory for the
667 shared state manifest files.
668 The shared state code uses these files to record the files
669 installed by each sstate task so that the files can be removed
670 when cleaning the recipe or when a newer version is about to
671 be installed.
672 The build system also uses the manifests to detect and produce
673 a warning when files from one task are overwriting those from
674 another.
675 </para>
676 </section>
677
662 <section id='structure-build-tmp-sysroots'> 678 <section id='structure-build-tmp-sysroots'>
663 <title><filename>build/tmp/sysroots/</filename></title> 679 <title><filename>build/tmp/sysroots/</filename></title>
664 680