diff --git a/contrib/man/md/docker-start.1.md b/contrib/man/md/docker-start.1.md
index 9e639bbb5e..2815f1b07f 100644
--- a/contrib/man/md/docker-start.1.md
+++ b/contrib/man/md/docker-start.1.md
@@ -20,6 +20,10 @@ the process
 **-i**, **--interactive**=*true*|*false*
    When true attach to container's stdin
 
+# NOTES
+If run on a started container, start takes no action and succeeds
+unconditionally.
+
 # HISTORY
 April 2014, Originally compiled by William Henry (whenry at redhat dot com)
 based on docker.io source material and internal work.
diff --git a/docs/sources/reference/commandline/cli.md b/docs/sources/reference/commandline/cli.md
index 16190ab1de..a93906865e 100644
--- a/docs/sources/reference/commandline/cli.md
+++ b/docs/sources/reference/commandline/cli.md
@@ -1139,6 +1139,9 @@ more details on finding shared images from the commandline.
       -a, --attach=false         Attach container's stdout/stderr and forward all signals to the process
       -i, --interactive=false    Attach container's stdin
 
+When run on a container that has already been started, 
+takes no action and succeeds unconditionally.
+
 ## stop
 
     Usage: docker stop [OPTIONS] CONTAINER [CONTAINER...]