diff --git a/README.md b/README.md
index ff0287e..78995a0 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,9 @@
 # scripts
-my scripts with descritpion
+
+Personal shell scripts collection.
+
+## Scripts
+
+| Script | Description |
+|--------|-------------|
+| [grayscale](grayscale/README.md) | Toggle grayscale mode on dual GPU (NVIDIA + Intel) Linux |
diff --git a/grayscale/README.md b/grayscale/README.md
new file mode 100644
index 0000000..ab4e5c5
--- /dev/null
+++ b/grayscale/README.md
@@ -0,0 +1,29 @@
+# grayscale
+
+Toggle grayscale mode on Linux with NVIDIA + Intel hybrid graphics.
+
+## Usage
+
+```bash
+grayscale        # toggle
+grayscale on     # enable grayscale
+grayscale off    # disable grayscale
+```
+
+## How it works
+
+- **NVIDIA**: Uses `nvidia-settings -a DigitalVibrance=-1024`
+- **Intel**: Uses xrandr CTM (Color Transformation Matrix)
+
+## Requirements
+
+- NVIDIA GPU with `nvidia-settings`
+- Intel GPU with xrandr CTM support
+- X11
+
+## Installation
+
+```bash
+cp grayscale ~/bin/
+chmod +x ~/bin/grayscale
+```
diff --git a/grayscale/grayscale b/grayscale/grayscale
new file mode 100755
index 0000000..4fa7d5a
--- /dev/null
+++ b/grayscale/grayscale
@@ -0,0 +1,35 @@
+#!/bin/bash
+
+STATE_FILE="$HOME/.grayscale_state"
+
+set_grayscale() {
+    nvidia-settings -a DigitalVibrance=-1024 >/dev/null 2>&1
+    xrandr --output eDP-1-1 --set CTM "0.299,0.587,0.114,0.299,0.587,0.114,0.299,0.587,0.114" 2>/dev/null
+    echo "on" > "$STATE_FILE"
+    echo "Grayscale: ON"
+}
+
+set_normal() {
+    nvidia-settings -a DigitalVibrance=0 >/dev/null 2>&1
+    xrandr --output eDP-1-1 --set CTM "1,0,0,0,1,0,0,0,1" 2>/dev/null
+    echo "off" > "$STATE_FILE"
+    echo "Grayscale: OFF"
+}
+
+toggle() {
+    if [[ -f "$STATE_FILE" ]] && [[ "$(cat "$STATE_FILE")" == "on" ]]; then
+        set_normal
+    else
+        set_grayscale
+    fi
+}
+
+case "${1:-toggle}" in
+    on)     set_grayscale ;;
+    off)    set_normal ;;
+    toggle) toggle ;;
+    *)
+        echo "Usage: grayscale [on|off|toggle]"
+        exit 1
+        ;;
+esac