diff --git a/hapi-fhir-jpaserver-base/src/main/java/ca/uhn/fhir/jpa/term/BaseHapiTerminologySvcImpl.java b/hapi-fhir-jpaserver-base/src/main/java/ca/uhn/fhir/jpa/term/BaseHapiTerminologySvcImpl.java
index d4b8e0f40e9..f1a8d5b49f3 100644
--- a/hapi-fhir-jpaserver-base/src/main/java/ca/uhn/fhir/jpa/term/BaseHapiTerminologySvcImpl.java
+++ b/hapi-fhir-jpaserver-base/src/main/java/ca/uhn/fhir/jpa/term/BaseHapiTerminologySvcImpl.java
@@ -999,6 +999,7 @@ public abstract class BaseHapiTerminologySvcImpl implements IHapiTerminologySvc,
 
 	private void addLoincFilterAncestorIn(String theSystem, QueryBuilder theQb, BooleanJunction<?> theBool, ValueSet.ConceptSetFilterComponent theFilter) {
 		throw new UnsupportedOperationException();
+		// FIXME: DM 2019-09-30 - Working on this presently.
 		// FIXME: DM 2019-09-25 - Filter with op=IN on ancestor; see #1512 in GitHub.
 		// FIXME: DM 2019-09-26 - Once implemented, fix changelog entry for #1454 in changes.xml
 //		String[] values = theFilter.getValue().split(",");