diff --git a/ODROID-U2.md b/ODROID-U2.md
index 42712c7..7acb026 100644
--- a/ODROID-U2.md
+++ b/ODROID-U2.md
@@ -11,4 +11,22 @@ ctl.!default {
    type hw
    card 0
 }
-```
\ No newline at end of file
+```
+
+## CPU Fan
+The optional CPU fan can be controlled via the `/sys/devices/platform/odroidu2-fan` 
+interface.
+
+```
+# echo auto > /sys/devices/platform/odroidu2-fan/fan_mode
+# echo manual > /sys/devices/platform/odroidu2-fan/fan_mode
+```
+
+### Fan Speed (Manual Only)
+Values range from 0 (0%) to 255 (100%)
+
+```
+# echo 0 > /sys/devices/platform/odroidu2-fan/pwm_duty
+# echo 255 > /sys/devices/platform/odroidu2-fan/pwm_duty
+```
+