diff --git a/Language-Conventions.md b/Language-Conventions.md
index cacdcb1..5a571ef 100644
--- a/Language-Conventions.md
+++ b/Language-Conventions.md
@@ -16,4 +16,4 @@ We try to provide a better terminology when we think that the traditional one is
 Help us translating at [OpenKeychain on Transifex](https://www.transifex.com/projects/p/open-keychain/).
 * Sometimes the translations of Enigmail can help: http://sourceforge.net/p/enigmail/source/ci/master/tree/lang/
 * On Transifex, please do not subdivide languages into regions, e.g. don't specify ``Italian (Italy)``, instead please only specify ``Italian``.
-* Exception: "zh_CN" and "zh_TW", but "zh" is not allowed
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+* Exception: "zh_CN" and "zh_TW", but "zh" is not allowed , see http://stackoverflow.com/q/4189875
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