diff --git a/readme_template.md b/readme_template.md
index c1bc5e36e..70d0ab7e4 100644
--- a/readme_template.md
+++ b/readme_template.md
@@ -47,7 +47,7 @@ versions (from locations defined by the update.info text file in each source's f
 
 **Usage**
 
-    python updateHostsFile.py [--auto]
+    python updateHostsFile.py [--auto] [--ip nnn.nnn.nnn.nnn]
 
 Command line options:
 
@@ -56,6 +56,9 @@ Command line options:
 * Host data sources are updated.
 * Your active hosts file is *not* replaced.
 
+`--ip nnn.nnn.nnn.nnn`: the IP address to use as the target.  Default is `0.0.0.0`.
+
+
 ## How do I control which sources are amalgamated?
 
 You can add additional sources by placing each in a subfolder of the `data/` folder. Provide a copy of that new