README: Mention that you can source individual script files

README.md

@@ -212,9 +212,12 @@ Add the following line to your shell configuration file.
   ```
 
 > [!NOTE]
-> `--bash`, `--zsh`, and `--fish` options are only available in
-> fzf 0.48.0 or above. If you have an older version of fzf, refer to the
-> package documentation for more information. (e.g. `apt show fzf`)
+> `--bash`, `--zsh`, and `--fish` options are only available in fzf 0.48.0 or
+> later. If you have an older version of fzf, or want finer control, you can
+> source individual script files in the [/shell](/shell) directory. The
+> location of the files may vary depending on the package manager you use.
+> Please refer to the package documentation for more information.
+> (e.g. `apt show fzf`)
 
 > [!TIP]
 > You can disable CTRL-T or ALT-C binding by setting `FZF_CTRL_T_COMMAND` or