diff --git a/brightness-adjust.sh b/brightness-adjust.sh
new file mode 100644
index 0000000..cfb7902
--- /dev/null
+++ b/brightness-adjust.sh
@@ -0,0 +1,15 @@
+#!/bin/sh
+
+# This is a script to set my external monitor's brightness
+# to high (70%) or low (40%) easily. It uses ddcutil to access
+# the monitor's settings. When used in conjunction with heliocron,
+# it can manage the monitor brightness based on sunrise or sunset,
+# which can be useful if you like to work in natural light.
+
+if [ $1 == "high" ]; then
+    ddcutil setvcp 10 70 && echo "Monitor brightness set to 70%"
+elif [ $1 == "low" ]; then
+    ddcutil setvcp 10 40 && echo "Monitor brightness set to 40%"
+else
+    echo "Please pass high/low"
+fi