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-rw-r--r--docs/design/areas.xml5
1 files changed, 4 insertions, 1 deletions
diff --git a/docs/design/areas.xml b/docs/design/areas.xml
index 201fb6035..a58a2eaf9 100644
--- a/docs/design/areas.xml
+++ b/docs/design/areas.xml
@@ -7,7 +7,10 @@ defined in the specification. A number of optimisations may be possible
for similar areas and groups of areas.
</para>
<para>
-
+Since the area tree will be used during the layout by the layout managers
+it will need to store information that affects the layout. The information
+such as spacing and keeps will be held in such a way that it can be
+discarded once the layout is finalised.
</para>
</section>