diff --git a/src/signed-xml.ts b/src/signed-xml.ts
index 58ad061b..841e23c1 100644
--- a/src/signed-xml.ts
+++ b/src/signed-xml.ts
@@ -137,10 +137,6 @@ export class SignedXml {
    */
   private references: Reference[] = [];
 
-  /**
-   * The PrefixList each Transform of a loaded {@link Reference} carries, in transform order, which
-   * verification applies.
-   */
   private loadedPrefixLists = new WeakMap<Reference, string[][]>();
 
   /**
diff --git a/test/README.md b/test/README.md
index 12e7e5d7..98935dde 100644
--- a/test/README.md
+++ b/test/README.md
@@ -1,7 +1,9 @@
 # Test fixtures
 
-These fixtures in `static/` were signed by other XML-DSig implementations, so the tests that use them check interoperability rather than only this library's agreement with itself. This library can't regenerate them.
+This records who signed these fixtures in `static/`. One signed by another XML-DSig implementation checks interoperability rather than only this library's agreement with itself.
 
 - `hmac_signature.xml` and `hmac.key`: signed with the JDK's `javax.xml.crypto.dsig`.
-- `inclusive_namespaces_*.xml`: signed with `client.pem` by other signers or by xml-crypto 6.3.2.
+- `inclusive_namespaces_exc_c14n.xml`, `inclusive_namespaces_exc_c14n_with_comments.xml`, `inclusive_namespaces_enveloped_signature_after_exc_c14n.xml`, `inclusive_namespaces_on_second_of_two_exc_c14n.xml` and `inclusive_namespaces_after_custom_transform.xml`: signed with .NET's `System.Security.Cryptography.Xml.SignedXml` and `client.pem`.
+- `inclusive_namespaces_prefix_list_with_tab.xml`: its document and reference digest come from .NET's `SignedXml`. Its `SignedInfo` was canonicalized with libxml2 and signed with openssl and `client.pem`.
+- `inclusive_namespaces_in_with_comments_namespace.xml`: signed with xml-crypto 6.3.2 and `client.pem`. It checks that a signature from 6.3.2 or earlier still verifies, not interoperability. Those releases wrote a reference's `InclusiveNamespaces` under every `Transform`, in a namespace named after that Transform's `Algorithm`.
 - `windows_store_signature.xml` and `windows_store_certificate.pem`: a Windows Store app receipt and the certificate that verifies it.
diff --git a/test/signature-integration-tests.spec.ts b/test/signature-integration-tests.spec.ts
index 9d8d5e28..50b8ef93 100644
--- a/test/signature-integration-tests.spec.ts
+++ b/test/signature-integration-tests.spec.ts
@@ -478,6 +478,8 @@ describe("Signature integration tests", function () {
       "inclusive_namespaces_exc_c14n.xml",
       "inclusive_namespaces_exc_c14n_with_comments.xml",
       "inclusive_namespaces_enveloped_signature_after_exc_c14n.xml",
+      // Signed by xml-crypto 6.3.2, which wrote InclusiveNamespaces outside the exc-c14n namespace:
+      // https://github.com/node-saml/xml-crypto/issues/633
       "inclusive_namespaces_in_with_comments_namespace.xml",
       // PrefixList="a&#x9;b" is white space delimited: https://www.w3.org/TR/xml-exc-c14n/#sec-Use
       "inclusive_namespaces_prefix_list_with_tab.xml",