diff --git a/changelog.d/4498.misc b/changelog.d/4498.misc
new file mode 100644
index 0000000000..8b3bc94a34
--- /dev/null
+++ b/changelog.d/4498.misc
@@ -0,0 +1 @@
+Clarify documentation for the `public_baseurl` config param
diff --git a/synapse/config/server.py b/synapse/config/server.py
index 22dcc87d8a..268a43ff00 100644
--- a/synapse/config/server.py
+++ b/synapse/config/server.py
@@ -261,7 +261,7 @@ class ServerConfig(Config):
         # enter into the 'custom HS URL' field on their client. If you
         # use synapse with a reverse proxy, this should be the URL to reach
         # synapse via the proxy.
-        # public_baseurl: https://example.com:8448/
+        # public_baseurl: https://example.com/
 
         # Set the soft limit on the number of file descriptors synapse can use
         # Zero is used to indicate synapse should set the soft limit to the