Update README.md

diff --git a/ADVANCED TOPICS/README.md b/ADVANCED TOPICS/README.md
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@@ -7,7 +7,7 @@ Here you will find links to some advanced features and things you can do with Sh
 * [Statistics](Statistics.md).
 * Setting up an [MQTT](../MQTT.md) system.
 * [Digital Signal Processing](https://github.com/mikebrady/shairport-sync/wiki/Digital-Signal-Processing-with-Shairport-Sync).
-* [Car Installation](CAR%20INSTALL.md)
+* [Car Installation](../CAR%20INSTALL.md)
 – build an isolated WiFi network containing a Shairport Sync player on a Raspberry Pi. Suitable for a car radio with an `aux` input or for the stereo in that broadband-free holiday cottage.
 
 The configuration file -- which contains lots of documentation -- is on your system. By default, the sample configuration file is