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--- a/README.md
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@@ -2,4 +2,7 @@
 Shell scripts that perform automatic logins for the
 [Travelmate](https://openwrt.org/docs/guide-user/network/wifi/wifiextenders/travelmate) plugin.
 On the device, they live in `/etc/travelmate/*.login` and have to be executable.
-Calling arguments can be used and customized.
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+Calling arguments can be used and customized.
+
+## Testing
+`test/functions.sh` is a mock implementation that should be symlinked to `/lib/functions.sh`.
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