Add a missing backtick

docs/Shell-Completion.md

@@ -8,7 +8,7 @@ You must configure your shell to enable its completion support. This is because
 
 ## Configuring Completions in `bash`
 
-To make Homebrew's completions available in `bash`, you must source the definitions as part of your shell's startup. Add the following to your `~/.bash_profile` (or, if it doesn't exist, `~/.profile):
+To make Homebrew's completions available in `bash`, you must source the definitions as part of your shell's startup. Add the following to your `~/.bash_profile` (or, if it doesn't exist, `~/.profile`):
 
 ```sh
 if type brew &>/dev/null; then