diff --git a/schema/bom-1.6.proto b/schema/bom-1.6.proto
index c182a815..0023df1f 100644
--- a/schema/bom-1.6.proto
+++ b/schema/bom-1.6.proto
@@ -280,7 +280,7 @@ enum ExternalReferenceType {
   EXTERNAL_REFERENCE_TYPE_EVIDENCE = 36;
   // Describes how a component or service was manufactured or deployed.
   EXTERNAL_REFERENCE_TYPE_FORMULATION = 37;
-  // URL to a source archive.
+  // The location where the source code distributable can be obtained. This is often an archive format such as zip or tgz. The source-distribution type complements use of the version control (vcs) type.
   EXTERNAL_REFERENCE_TYPE_SOURCE_DISTRIBUTION = 38;
   // An e-signature is commonly a scanned representation of a written signature or a stylized script of the persons name.
   EXTERNAL_REFERENCE_TYPE_ELECTRONIC_SIGNATURE = 39;
diff --git a/schema/bom-1.6.schema.json b/schema/bom-1.6.schema.json
index b0b5bede..8fc57e40 100644
--- a/schema/bom-1.6.schema.json
+++ b/schema/bom-1.6.schema.json
@@ -1726,7 +1726,7 @@
             "chat": "Real-time chat platform",
             "documentation": "Documentation, guides, or how-to instructions",
             "support": "Community or commercial support",
-            "source-distribution": "URL to a source archive",
+            "source-distribution": "The location where the source code distributable can be obtained. This is often an archive format such as zip or tgz. The source-distribution type complements use of the version control (vcs) type.",
             "distribution": "Direct or repository download location",
             "distribution-intake": "The location where a component was published to. This is often the same as \"distribution\" but may also include specialized publishing processes that act as an intermediary.",
             "license": "The reference to the license file. If a license URL has been defined in the license node, it should also be defined as an external reference for completeness.",
diff --git a/schema/bom-1.6.xsd b/schema/bom-1.6.xsd
index 6f727602..8bed34d7 100644
--- a/schema/bom-1.6.xsd
+++ b/schema/bom-1.6.xsd
@@ -1323,7 +1323,7 @@ limitations under the License.
             </xs:enumeration>
             <xs:enumeration value="source-distribution">
                 <xs:annotation>
-                    <xs:documentation>URL to a source archive</xs:documentation>
+                    <xs:documentation>The location where the source code distributable can be obtained. This is often an archive format such as zip or tgz. The source-distribution type complements use of the version control (vcs) type.</xs:documentation>
                 </xs:annotation>
             </xs:enumeration>
             <xs:enumeration value="distribution">