@@ -1142,14 +1142,17 @@ volume mounted on the host).

 ### USER

-The default user within a container is `root` (id = 0), but if the

-developer created additional users, those are accessible too. The

-developer can set a default user to run the first process with the

-Dockerfile `USER` instruction, but the operator can override it:

+`root` (id = 0) is the default user within a container. The image developer can

+create additional users. Those users are accessible by name.  When passing a numeric

+ID, the user does not have to exist in the container.

+

+The developer can set a default user to run the first process with the

+Dockerfile `USER` instruction. When starting a container, the operator can override

+the `USER` instruction by passing the `-u` option.

     -u="": Username or UID

-> **Note:** if you pass numeric uid, it must be in range 0-2147483647.

+> **Note:** if you pass a numeric uid, it must be in the range of 0-2147483647.

 ### WORKDIR