diff --git a/README.md b/README.md
index 5d8a807..ca95662 100755
--- a/README.md
+++ b/README.md
@@ -76,7 +76,7 @@ vi config         # Edit your config file. See above.
 ```
 
 If everything goes well, your finished image will be in the `deploy/` folder.
-You can then remove the build container with `docker rm pigen_work`
+You can then remove the build container with `docker rm -v pigen_work`
 
 If something breaks along the line, you can edit the corresponding scripts, and
 continue: