diff --git a/README.md b/README.md
index 76b145b..a9fa5f3 100644
--- a/README.md
+++ b/README.md
@@ -102,3 +102,31 @@ dockerfiles
     - [x] standalone-firefox
 - [x] tutum/builder
 
+## auto-completion
+
+```bash
+#!/bin/bash
+#
+# handy auto-completion for docker-exec
+#
+
+enter() {
+  local name=${1:?}
+  docker exec -it $name sh -c 'exec $(command -v bash || command -v sh)'
+}
+
+__enter() {
+  local cur=${COMP_WORDS[COMP_CWORD]}
+  for cid in $(docker ps -q)
+  do
+    local name=$(docker inspect -f '{{.Name}}' $cid)
+    name=${name#/}
+    if [[ $name = $cur* ]]
+    then
+      COMPREPLY+=("$name")
+    fi
+  done
+}
+
+complete -F __enter enter
+```