Document Bash completion setup

examples/core/README.md

@@ -19,7 +19,8 @@ alias. Its declaration slice mixes the canonical group and routing rules as
 are visible in the output.
 
 The example also installs `Completion("core-example")` and gives the `report`
-scenario argument static choices. Build it with the basename shown above, load
+scenario argument static choices. Initialize `bash-completion` first if using
+Bash. Build it with the basename shown above, load
 the script for your shell using the [CLI reference](../../docs/cli.md#shell-completion),
 and try completing `core-example report d` or `core-example ws gr`.