home.md

@@ -11,4 +11,6 @@ Marcus Flyvholm Haagh 201303619
 
 [Lesson 2](https://gitlab.au.dk/stil1234/mindstrom_2014/wikis/week-3-sensing-and-sensors-analog%7Cdigital-conversion)
 
-[Lesson 3](https://gitlab.au.dk/stil1234/mindstrom_2014/wikis/lesson-3-acting-and-actuators)
+[Lesson 3](https://gitlab.au.dk/stil1234/mindstrom_2014/wikis/lesson-3-acting-and-actuators)
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+
+[Lesson 4](https://gitlab.au.dk/stil1234/mindstrom_2014/wikis/lesson-4-color-detection)
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