diff --git a/fan_control.sh b/fan_control.sh
index 9d30a99..e743a8f 100644
--- a/fan_control.sh
+++ b/fan_control.sh
@@ -11,6 +11,7 @@
 IDRAC_IP="IP address of iDRAC"
 IDRAC_USER="user"
 IDRAC_PASSWORD="passowrd"
+# Fan speed in %
 SPEED0="0x00"
 SPEED5="0x05"
 SPEED10="0x0a"