diff --git a/common/source/java/ch/systemsx/cisd/common/ssl/SslCertificateHelper.java b/common/source/java/ch/systemsx/cisd/common/ssl/SslCertificateHelper.java
index 92bf1fb31945594cd11964af96ce4758cb468995..4dbf258106b89d4f4e799deaa821bd917c618e47 100644
--- a/common/source/java/ch/systemsx/cisd/common/ssl/SslCertificateHelper.java
+++ b/common/source/java/ch/systemsx/cisd/common/ssl/SslCertificateHelper.java
@@ -94,7 +94,7 @@ public class SslCertificateHelper
             int port = url.getPort();
             if (port == -1)
             {
-                port = 433;
+                port = 433; // standard port for https
             }
             String hostname = url.getHost();
             SSLSocketFactory factory = HttpsURLConnection.getDefaultSSLSocketFactory();