diff --git a/Dockerfile b/Dockerfile
index fbbd1fe4..8d4ebb2d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,7 +4,7 @@ RUN apk --no-cache update && apk upgrade && \
     apk add util-linux pciutils usbutils coreutils binutils\
     findutils grep man man-pages mdocml-apropos less less-doc \
     make grep zsh zsh-vcs zsh-zftp zsh-calendar zsh-doc git \
-    vim git-zsh-completion tmux tmux-zsh-completion \
+    vim git-zsh-completion tmux tmux-zsh-completion tree \
     docker-zsh-completion
 RUN addgroup prezto && adduser -D prezto -G prezto -S /bin/zsh
 WORKDIR /home/prezto
diff --git a/Makefile b/Makefile
index b77f3a10..5507073e 100755
--- a/Makefile
+++ b/Makefile
@@ -96,8 +96,9 @@ run: .container/image
 # Removes the current container and image, so we can build a new one
 # from scratch. If you want a real clean slate, then "make realclean"
 clean:
-	docker container rm $(TAG):
-	docker image rm $(TAG):
+	docker container rm $(TAG)
+	docker image rm $(TAG)
+	rm -fv .container/*
 
 # Deep cleaning, will remove dangling (intermediate build) images
 # and containers for which a final image or container cannot be found
@@ -105,6 +106,7 @@ clean:
 # containers. Run every once in a while.
 realclean:
 	$(MAKE) clean
+	docker rmi $(TAG)
 	docker container prune
 	docker image prune
 
diff --git a/container-README.md b/container-README.md
index a528c58a..f016dc4b 100644
--- a/container-README.md
+++ b/container-README.md
@@ -8,6 +8,8 @@ in which to quickly make changes to either prezto-core or any plugin
 that may bein development, enabling automated testing and even
 continuous integration.
 
+[![asciicast](https://asciinema.org/a/277054.svg)](https://asciinema.org/a/277054)
+
 The container is a basic install of alpine linux, so the image
 download is reasonably small