README.md: update blacklist description

1 files changed, 4 insertions, 2 deletions

diff --git a/README.md b/README.md
index d1c1712c..3c577877 100644
--- a/README.md
+++ b/README.md
@@ -4,10 +4,12 @@ It is currently hosted on https://git.archlinux32.org/archlinux32/packages.
 
 * There are subdirectories `repository/package` which contain new packages and customizations for existent packages to compile for i686 or adopt to our environment.
 In case, the files therein exist in the respective original package, the respective original package files are either appended (in case of `PKGBUILD`) or overwritten (for other files).
-* The file `blacklist` containes a list of packages which won't be built for i686 (because they can't be built for or are useless on i686).
+* The file `blacklist` containes a list of packages which won't be built for Arch Linux 32 (because they can't be built for or are useless on i686).
+An entry in this file consist of an architecture and a pkgbase separated by a space.
+The given package will be black listed for all architectures less potent than the given one or, if "any" is given, for all architectures.
 * The file `extra-from-multilib` contains a list of packages which are in multilib for x86_64, but belong in extra (and not community) for i686.
 
 Additional to the abovementioned changes to the package sources, the following changes are made automatically by the [build master's mangle_pkgbuild()](https://github.com/archlinux32/builder/blob/master/lib/common-functions) which should therefor **not** be committed here:
 * append architectures to `arch` array
 * append our sub_pkgrel
-* remove `lib32-` prefixes if present
\ No newline at end of file
+* remove `lib32-` prefixes if present