diff --git a/docs/sources/reference/commandline/cli.md b/docs/sources/reference/commandline/cli.md
index 98dd483263..3cfb1854d7 100644
--- a/docs/sources/reference/commandline/cli.md
+++ b/docs/sources/reference/commandline/cli.md
@@ -1736,9 +1736,12 @@ ports in Docker.
 
 This sets environmental variables in the container. For illustration all three
 flags are shown here. Where `-e`, `--env` take an environment variable and
-value, or if no "=" is provided, then that variable's current value is passed
-through (i.e. `$MYVAR1` from the host is set to `$MYVAR1` in the container). All
-three flags, `-e`, `--env` and `--env-file` can be repeated.
+value, or if no `=` is provided, then that variable's current value is passed
+through (i.e. `$MYVAR1` from the host is set to `$MYVAR1` in the container). 
+When no `=` is provided and that variable is not defined in the client's
+environment then that variable will be removed from the container's list of
+environment variables.
+All three flags, `-e`, `--env` and `--env-file` can be repeated.
 
 Regardless of the order of these three flags, the `--env-file` are processed
 first, and then `-e`, `--env` flags. This way, the `-e` or `--env` will