@@ -164,6 +164,11 @@ any point in an image's history, much like source control.

 The *exec* form makes it possible to avoid shell string munging, and to `RUN`

 commands using a base image that does not contain `/bin/sh`.

+> **Note**:

+> To use a different shell, other than '/bin/sh', use the *exec* form

+> passing in the desired shell. For example,

+> `RUN ["/bin/bash", "-c", "echo hello"]`

+

 The cache for `RUN` instructions isn't invalidated automatically during

 the next build. The cache for an instruction like `RUN apt-get

 dist-upgrade -y` will be reused during the next build.  The cache for