diff --git a/firewall/README.md b/firewall/README.md
index 72ffd2ef..7d0f09f5 100644
--- a/firewall/README.md
+++ b/firewall/README.md
@@ -8,6 +8,6 @@ First idea: the ports that need to be opened are:
 
 | Port(s) / range | Protocol | Application |
 | :--: | :--: | :-- |
-| 80/443 | TCP | Reverse proxy |
+| 80, 443 | TCP | Reverse proxy |
 | 8443 | TCP | Synapse, federation |