Fix doc ambiguity, fixes #7471

doc/01-basic-usage.md

@@ -154,8 +154,10 @@ and running `install` again.)
 ```sh
 php composer.phar update
 ```
+
 > **Note:** Composer will display a Warning when executing an `install` command
-> if `composer.lock` and `composer.json` are not synchronized.
+> if the `composer.lock` has not been updated since changes were made to the
+> `composer.json` that might affect dependency resolution.
 
 If you only want to install or update one dependency, you can whitelist them: