Added a warning for git commit -a -m""

Author: rodsouza9

book/02-git-basics/sections/recording-changes.asc

@@ -466,7 +466,8 @@ $ git commit -a -m 'added new benchmarks'
 ----
 
 Notice how you don't have to run `git add` on the `CONTRIBUTING.md` file in this case before you commit.
-But beware because you can commit files that you don't necesarily want to commit.
+But beware because you can commit files that you don't necesarily want to commit. Be diligent when you need to commit files, and most
+of the time you should stage and then commit you files.
 
 [[_removing_files]]
 ==== Removing Files