diff --git a/Installing.md b/Installing.md
index 381730d..4d8e2f5 100644
--- a/Installing.md
+++ b/Installing.md
@@ -25,4 +25,10 @@ The configuration utility will guide you through the process of:
 
 The configuration will be saved as `gravity-sync.conf` in `/etc/gravity-sync`. If you need to make adjustments to your settings in the future, you can edit this file or run the configuration tool to generate a new one.
 
-After you're pleased with your configuration of both Gravity Sync instances, proceed to the Execution phase.
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+After you're pleased with your configuration of both Gravity Sync instances, proceed to the Execution phase.
+
+### Custom SSH Ports
+
+Gravity Sync is configured by default to use the standard SSH port (22) but if you need to change this, such as if you're traversing a NAT/firewall for a multi-site deployment, you can use a non-standard port. When running `gravity-sync config` on an install with non-standard SSH ports, you can specify the target SSH port number in the config command.
+
+**Example:** `gravity-sync config 1234` (where 1234 is the remote SSH port)
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