diff --git a/Manual.md b/Manual.md
index 072701ff7ca..59f78eca735 100644
--- a/Manual.md
+++ b/Manual.md
@@ -415,8 +415,11 @@ set to `${pkgname}-${version}`.
 - `create_wrksrc` Enable it to create the `${wrksrc}` directory. Required if a package
 contains multiple `distfiles`.
 
-- `only_for_archs` This expects a separated list of architectures where the package can be
-built matching `uname -m` output. Example `only_for_archs="x86_64 armv6l"`
+- `only_for_archs` This expects a separated list of architectures where
+the package can be built matching `uname -m` output. Reserved for uses
+where the program really only will ever work on certain architectures, like
+binary distributions or where the program is written in assembly. Example
+`only_for_archs="x86_64 armv6l"`.
 
 - `build_style` This specifies the `build method` for a package. Read below to know more
 about the available package `build methods`. If `build_style` is not set,