diff --git a/input/ignoreWarnings.txt b/input/ignoreWarnings.txt
index a7356e7c36..788ff9273e 100644
--- a/input/ignoreWarnings.txt
+++ b/input/ignoreWarnings.txt
@@ -9,4 +9,5 @@ A definition for CodeSystem 'http://hl7.org/fhir/sid/icd-11' could not be found,
 The modifier extension http://hl7.org/fhir/1.0/StructureDefinition/extension-ConceptMap.element.target.equivalence from FHIR version 1.0 is not allowed to be used at this point (allowed = e:ConceptMap.element.target; this element is [[BackboneElement, ConceptMap.group.element.target]; this is a warning since contexts may be renamed between FHIR versions)
 Wrong Display Name 'First name' for http://loinc.org#45392-8
 Wrong Display Name 'Last name' for http://loinc.org#45394-4
+Unknown System 'http://hl7.org/fhir/sid/icd-11' specified, so Concepts and Filters can't be checked (Details: A definition for CodeSystem 'http://hl7.org/fhir/sid/icd-11' could not be found, so the code cannot be validated)