1 files changed, 2 insertions, 1 deletions
diff --git a/doc/PKGBUILD.5.txt b/doc/PKGBUILD.5.txt
index 3d3d1b59..cbd02e88 100644
--- a/doc/PKGBUILD.5.txt
+++ b/doc/PKGBUILD.5.txt
@@ -169,7 +169,8 @@ contain whitespace characters.
 *arch (array)*::
 	Defines on which architectures the given package is available (e.g.,
 	`arch=('i686' 'x86_64')`). Packages that contain no architecture specific
-	files should use `arch=('any')`.
+	files should use `arch=('any')`. Valid characters for members of this array
+	are alphanumerics and ```_`''.
 
 *backup (array)*::
 	An array of file names, without preceding slashes, that