diff --git a/docs/man/docker-exec.1.md b/docs/man/docker-exec.1.md
index d5ec1265bd..38ba3de412 100644
--- a/docs/man/docker-exec.1.md
+++ b/docs/man/docker-exec.1.md
@@ -15,6 +15,12 @@ docker-exec - Run a command in a running container
 
 Run a process in a running container. 
 
+The command started using `docker exec` will only run while the container's primary
+process (`PID 1`) is running, and will not be restarted if the container is restarted.
+
+If the container is paused, then the `docker exec` command will wait until the
+container is unpaused, and then run.
+
 # Options
 
 **-d**, **--detach**=*true*|*false*
diff --git a/docs/sources/reference/commandline/cli.md b/docs/sources/reference/commandline/cli.md
index 50c0ff3cce..e0a7b2328a 100644
--- a/docs/sources/reference/commandline/cli.md
+++ b/docs/sources/reference/commandline/cli.md
@@ -646,7 +646,11 @@ You'll need two shells for this example.
 
 The `docker exec` command runs a new command in a running container.
 
-The `docker exec` command will typically be used after `docker run` or `docker start`.
+The command started using `docker exec` will only run while the container's primary
+process (`PID 1`) is running, and will not be restarted if the container is restarted.
+
+If the container is paused, then the `docker exec` command will wait until the
+container is unpaused, and then run.
 
 #### Examples