diff --git a/validator/manifest.json b/validator/manifest.json
index 7a99ec80..01bec98b 100644
--- a/validator/manifest.json
+++ b/validator/manifest.json
@@ -17943,7 +17943,7 @@
                 "severity": "error",
                 "code": "structure",
                 "details": {
-                  "text": "The type of element valueString is not known, which is invalid. Valid types at this point are Quantity, CodeableConcept"
+                  "text": "The type of element valueString is not known - it could not be determined from the information available. Valid types at this point are Quantity, CodeableConcept"
                 },
                 "diagnostics": "[12,25]",
                 "expression": [