diff --git a/hapi-fhir-base/src/main/java/ca/uhn/fhir/model/primitive/IdDt.java b/hapi-fhir-base/src/main/java/ca/uhn/fhir/model/primitive/IdDt.java
index 171a7f7104a..25f66df59dd 100644
--- a/hapi-fhir-base/src/main/java/ca/uhn/fhir/model/primitive/IdDt.java
+++ b/hapi-fhir-base/src/main/java/ca/uhn/fhir/model/primitive/IdDt.java
@@ -49,7 +49,7 @@ import ca.uhn.fhir.util.UrlUtil;
  * limit of 36 characters.
  * </p>
  * <p>
- * regex: [a-z0-9\-\.]{1,36}
+ * regex: [a-z-Z0-9\-\.]{1,36}
  * </p>
  */
 @DatatypeDef(name = "id", profileOf=StringDt.class)
diff --git a/hapi-fhir-structures-dstu3/src/main/java/org/hl7/fhir/dstu3/model/IdType.java b/hapi-fhir-structures-dstu3/src/main/java/org/hl7/fhir/dstu3/model/IdType.java
index c32a5849a91..8bb8dc5bafa 100644
--- a/hapi-fhir-structures-dstu3/src/main/java/org/hl7/fhir/dstu3/model/IdType.java
+++ b/hapi-fhir-structures-dstu3/src/main/java/org/hl7/fhir/dstu3/model/IdType.java
@@ -79,7 +79,7 @@ import ca.uhn.fhir.model.api.annotation.DatatypeDef;
  * identity on objects it creates as a convenience.
  * </p>
  * <p>
- * Regex for ID: [a-z0-9\-\.]{1,36}
+ * Regex for ID: [a-zA-Z0-9\-\.]{1,36}
  * </p>
  */
 @DatatypeDef(name = "id", profileOf=StringType.class)