diff --git a/doc/docker/build.sh b/doc/docker/build.sh
index 5f412ee..02cabee 100755
--- a/doc/docker/build.sh
+++ b/doc/docker/build.sh
@@ -1,3 +1,8 @@
 #!/bin/sh
 
-docker build -t git.tkolb.de/amateurfunk/hamnet70/asciidoctor:1.2 .
+if [ -z "$1" ]; then
+	echo "usage: $0 <tag-version>"
+	exit 1
+fi
+
+docker build -t git.tkolb.de/amateurfunk/hamnet70/asciidoctor:$1 .
diff --git a/doc/docker/upload.sh b/doc/docker/upload.sh
index 5fbb017..1733dce 100755
--- a/doc/docker/upload.sh
+++ b/doc/docker/upload.sh
@@ -1,5 +1,10 @@
 #!/bin/sh
 
+if [ -z "$1" ]; then
+	echo "usage: $0 <tag-version>"
+	exit 1
+fi
+
 docker login
-docker push git.tkolb.de/amateurfunk/hamnet70/asciidoctor:1.2
+docker push git.tkolb.de/amateurfunk/hamnet70/asciidoctor:$1
 docker logout