diff --git a/mystrom-on.sh b/mystrom-on.sh
new file mode 100755
index 0000000..7019f8f
--- /dev/null
+++ b/mystrom-on.sh
@@ -0,0 +1,17 @@
+#!/bin/sh
+# 2020-12-07, Nico Schottelius
+
+if [ $# -lt 1 ]; then
+    echo "$0 hostname [hostname...]"
+    echo "    hostname: which mystrom to turn on"
+    exit 1
+fi
+
+while [ $# -ge 1 ]; do
+    hostname=$1; shift
+
+    curl --location \
+         --request GET \
+         "http://${hostname}/relay?state=1"
+
+done