Clarify macOS instructions slightly

README.md

@@ -14,7 +14,7 @@ You will require a copy of the Freedesktop.org shared-mime-info database to be a
 it's probably available via your package manager, and will probably be in the location it's being looked for
 it's probably available via your package manager, and will probably be in the location it's being looked for
 when the gem is installed.
 when the gem is installed.
 
 
-macOS users can install via Homebrew with `brew install shared-mime-info`.
+macOS users can install the database via Homebrew with `brew install shared-mime-info`.
 
 
 If for whatever reason you can't do either of those things, you'll need to obtain a copy from the Internet. Set
 If for whatever reason you can't do either of those things, you'll need to obtain a copy from the Internet. Set
 the environment variable `FREEDESKTOP_MIME_TYPES_PATH` before installing the gem in order to point the build at
 the environment variable `FREEDESKTOP_MIME_TYPES_PATH` before installing the gem in order to point the build at