diff --git a/README.md b/README.md
index ad4b250..4f20fa7 100644
--- a/README.md
+++ b/README.md
@@ -48,6 +48,12 @@ go install github.com/eeeXun/gtt@latest
 docker run -it eeexun/gtt
 ```
 
+## Create a theme
+
+You can create a theme with theme name. And you must provide the color of `bg`, `fg`, `gray`, `red`, `green`, `yellow`, `blue`, `purple`, `cyan`, `orange`.
+
+See the example in [theme.yaml](example/theme.yaml) file. This file should located under `$XDG_CONFIG_HOME/gtt/theme.yaml` or `$HOME/.config/gtt/theme.yaml`
+
 ## Language in argument
 
 You can pass `-src` and `-dst` in argument to set source and destination language.