diff --git a/domainhandler.py b/domainhandler.py
index 9725c37b0..b7875b32a 100644
--- a/domainhandler.py
+++ b/domainhandler.py
@@ -21,6 +21,7 @@ def removeDomainPort(domain: str) -> str:
 
 def getPortFromDomain(domain: str) -> int:
     """If the domain has a port number appended then return it
+    eg. mydomain.com:80 returns 80
     """
     if ':' in domain:
         if domain.startswith('did:'):