diff --git a/tools/alpine/Makefile b/tools/alpine/Makefile
index 6769afad4..25624ba4d 100644
--- a/tools/alpine/Makefile
+++ b/tools/alpine/Makefile
@@ -6,6 +6,9 @@ BASE=alpine:3.6
 
 default: push
 
+show-tag:
+	@sed -n -e '1s/# \(.*\/.*:[0-9a-f]\{40\}\)/\1/p;q' versions
+
 hash: Dockerfile Makefile packages
 	DOCKER_CONTENT_TRUST=1 docker pull $(BASE)
 	docker build --no-cache -t $(IMAGE):build .
@@ -15,7 +18,8 @@ push: hash
 	DOCKER_CONTENT_TRUST=1 docker pull $(ORG)/$(IMAGE):$(shell cat hash) || \
 		(docker tag $(IMAGE):build $(ORG)/$(IMAGE):$(shell cat hash) && \
 		 DOCKER_CONTENT_TRUST=1 docker push $(ORG)/$(IMAGE):$(shell cat hash))
-	docker run --rm $(IMAGE):build find /mirror -name '*.apk' -exec basename '{}' .apk \; | sort | (echo '# automatically generated list of installed packages'; cat -) > versions
+	echo "# $(ORG)/$(IMAGE):$(shell cat hash)" > versions
+	docker run --rm $(IMAGE):build find /mirror -name '*.apk' -exec basename '{}' .apk \; | sort | (echo '# automatically generated list of installed packages'; cat -) >> versions
 	docker rmi $(IMAGE):build
 	rm -f hash
 
diff --git a/tools/alpine/versions b/tools/alpine/versions
index b14adcee4..0fa55b7fa 100644
--- a/tools/alpine/versions
+++ b/tools/alpine/versions
@@ -1,3 +1,4 @@
+# linuxkit/alpine:3744607156e6b67e3e7d083b15be9e7722215e73
 # automatically generated list of installed packages
 abuild-3.0.0_rc2-r7
 alpine-baselayout-3.0.4-r0