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@@ -1142,14 +1142,17 @@ volume mounted on the host).
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### USER
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-The default user within a container is `root` (id = 0), but if the
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-developer created additional users, those are accessible too. The
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-developer can set a default user to run the first process with the
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-Dockerfile `USER` instruction, but the operator can override it:
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+`root` (id = 0) is the default user within a container. The image developer can
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+create additional users. Those users are accessible by name. When passing a numeric
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+ID, the user does not have to exist in the container.
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+
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+The developer can set a default user to run the first process with the
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+Dockerfile `USER` instruction. When starting a container, the operator can override
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+the `USER` instruction by passing the `-u` option.
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-u="": Username or UID
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-> **Note:** if you pass numeric uid, it must be in range 0-2147483647.
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+> **Note:** if you pass a numeric uid, it must be in the range of 0-2147483647.
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### WORKDIR
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