diff --git a/src/main/resources/application.yaml b/src/main/resources/application.yaml
index 0e9bb7d..6bc6e90 100644
--- a/src/main/resources/application.yaml
+++ b/src/main/resources/application.yaml
@@ -31,6 +31,8 @@ hapi:
     ### enable to use the ApacheProxyAddressStrategy which uses X-Forwarded-* headers
     ### to determine the FHIR server address
 #   use_apache_address_strategy: false
+    ### forces the use of the https:// protocol for the returned server address.
+    ### alternatively, it may be set using the X-Forwarded-Proto header.
 #   use_apache_address_strategy_https: false
     ### enable to set the Server URL
 #    server_address: http://hapi.fhir.org/baseR4