Mention --completion in the README

README.md

@@ -465,6 +465,12 @@ cargo install --locked bat
 Note that additional files like the man page or shell completion
 files can not be installed in this way. They will be generated by `cargo` and should be available in the cargo target folder (under `build`).
 
+Shell completions are also available by running:
+```bash
+bat --completion <shell>
+# see --help for supported shells
+```
+
 ## Customization
 
 ### Highlighting theme