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-rw-r--r--doc/source/arch_cachekeys.rst3
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diff --git a/doc/source/arch_cachekeys.rst b/doc/source/arch_cachekeys.rst
index 8e74a37f9..0d469de4b 100644
--- a/doc/source/arch_cachekeys.rst
+++ b/doc/source/arch_cachekeys.rst
@@ -42,6 +42,9 @@ or the environment changes but it will not change when a dependency is updated.
For elements without build dependencies the ``strong`` cache key is identical
to the ``weak`` cache key.
+Note that dependencies which are not required at build time do not affect
+either kind of key.
+
Strict build plan
-----------------
This is the default build plan that exclusively uses ``strong`` cache keys