Update shell-integration.md

docs/shell-integration.md

@@ -16,6 +16,11 @@ shell program to emit the escape sequences at the appropriate place.
 
 You can find some [examples for various shells in the wezterm
 repo](https://github.com/wez/wezterm/tree/main/assets/shell-integration).
+
+To use this file to setup shell integration in wezterm with Bash or Zsh, you can
+copy the file to your computer and source it via `. /path/to/file.sh` in your `.bashrc`
+or `.zshrc`, or you can install it at `/etc/profile.d` if using Linux.
+
 Xonsh is supported via a [term-integrations](https://github.com/jnoortheen/xontrib-term-integrations) plugin.
 
 Starting with version 20210314-114017-04b7cedd, the Fedora and Debian packages