diff --git a/Manual.md b/Manual.md
index ab13b1c38e..8a8954e88d 100644
--- a/Manual.md
+++ b/Manual.md
@@ -704,6 +704,9 @@ used.
 - `archs` Whitespace separated list of architectures that a package can be
 built for, available architectures can be found under `common/cross-profiles`
 alongside the `noarch` value for packages that do not contain any machine code.
+In general, `archs` should only be set if the upstream software explicitly targets
+certain architectures or there is a compelling reason why the software should not be
+available on some supported architectures.
 Examples:
 
 	```