diff --git a/jetty-http2/http2-http-client-transport/src/main/java/org/eclipse/jetty/http2/client/http/HttpClientTransportOverHTTP2.java b/jetty-http2/http2-http-client-transport/src/main/java/org/eclipse/jetty/http2/client/http/HttpClientTransportOverHTTP2.java
index 4be18e3feabf..743e00110f71 100644
--- a/jetty-http2/http2-http-client-transport/src/main/java/org/eclipse/jetty/http2/client/http/HttpClientTransportOverHTTP2.java
+++ b/jetty-http2/http2-http-client-transport/src/main/java/org/eclipse/jetty/http2/client/http/HttpClientTransportOverHTTP2.java
@@ -60,6 +60,8 @@ public HttpClientTransportOverHTTP2(HTTP2Client client)
         setConnectionPoolFactory(destination ->
         {
             HttpClient httpClient = getHttpClient();
+            // Start with the minimum maxMultiplex; the SETTINGS frame from the
+            // server preface will override this value before any request is sent.
             return new MultiplexConnectionPool(destination, httpClient.getMaxConnectionsPerDestination(), destination, 1);
         });
     }