diff --git a/testing/wifi-testing/README.md b/testing/wifi-testing/README.md
index 992af53f..97d3925f 100644
--- a/testing/wifi-testing/README.md
+++ b/testing/wifi-testing/README.md
@@ -18,6 +18,8 @@ This utility helps test how many such connections are allowed for a given config
   * ctrl_interface=/var/run/hostapd
   * ctrl_interface_group=0
 
+run ctl-hostapd to do this.
+
 * Run stat-serve.py from this directory
 
 ## Hardware
diff --git a/testing/wifi-testing/ctl-hostapd b/testing/wifi-testing/ctl-hostapd
new file mode 100755
index 00000000..e1f0e5ce
--- /dev/null
+++ b/testing/wifi-testing/ctl-hostapd
@@ -0,0 +1,6 @@
+#!/bin/sh
+cat >> /etc/hostapd/hostapd.conf << EOF
+ctrl_interface=/var/run/hostapd
+ctrl_interface_group=0
+EOF
+systemctl restart hostapd