diff --git a/_alerts/2015-10-12-upnp-vulnerability.md b/_alerts/2015-10-12-upnp-vulnerability.md
index 7b3e2547..5475c4a0 100644
--- a/_alerts/2015-10-12-upnp-vulnerability.md
+++ b/_alerts/2015-10-12-upnp-vulnerability.md
@@ -5,7 +5,7 @@
 title: "Vulnerability in UPnP library used by Bitcoin Core"
 shorturl: "upnp-vulnerability"
 active: true
-#banner: "WARNING: serious vulnerability in UPnP library used by Bitcoin Core (click here to read)"
+banner: "WARNING: serious vulnerability in UPnP library used by Bitcoin Core (click here to read)"
 bannerclass: "alert"
 ---
 
@@ -54,3 +54,11 @@ makes it harder to use this vulnerability for remote code execution or private
 key leaks. However, it is still advised to upgrade, or if not possible, disable
 UPnP as soon as possible.
 
+## Manual Port Forwarding
+
+With UPnP turned off, your node will still connect to 8 other peers on
+the Bitcoin network to receive new blocks and transactions.  However, it
+will not accept incomming connections from other peers unless you
+manually enable port forwarding on your router.  If you wish to do
+that---it isn't required---please [follow these
+instructions](/en/full-node#network-configuration).