diff --git a/doc/release-notes/10060-api-changelog.md b/doc/release-notes/10060-api-changelog.md
new file mode 100644
index 00000000000..56ac96e3564
--- /dev/null
+++ b/doc/release-notes/10060-api-changelog.md
@@ -0,0 +1,3 @@
+We have started maintaining an API changelog: https://dataverse-guide--10127.org.readthedocs.build/en/10127/api/changelog.html
+
+See also #10060.
diff --git a/doc/sphinx-guides/source/api/changelog.rst b/doc/sphinx-guides/source/api/changelog.rst
new file mode 100644
index 00000000000..d6742252d27
--- /dev/null
+++ b/doc/sphinx-guides/source/api/changelog.rst
@@ -0,0 +1,13 @@
+API Changelog 
+=============
+
+.. contents:: |toctitle|
+    :local:
+    :depth: 1
+
+6.0
+-----
+
+Changes
+~~~~~~~
+- **/api/access/datafile**: When a null or invalid API token is provided to download a public (non-restricted) file with this API call, it will result on a ``401`` error response. Previously, the download was allowed (``200`` response). Please note that we noticed this change sometime between 5.9 and 6.0. If you can help us pinpoint the exact version (or commit!), please get in touch.
diff --git a/doc/sphinx-guides/source/api/index.rst b/doc/sphinx-guides/source/api/index.rst
index c9e79098546..dd195aa9d62 100755
--- a/doc/sphinx-guides/source/api/index.rst
+++ b/doc/sphinx-guides/source/api/index.rst
@@ -24,3 +24,4 @@ API Guide
    linkeddatanotification
    apps
    faq
+   changelog
\ No newline at end of file
diff --git a/src/test/java/edu/harvard/iq/dataverse/api/AccessIT.java b/src/test/java/edu/harvard/iq/dataverse/api/AccessIT.java
index 42e21e53101..d08f916243f 100644
--- a/src/test/java/edu/harvard/iq/dataverse/api/AccessIT.java
+++ b/src/test/java/edu/harvard/iq/dataverse/api/AccessIT.java
@@ -198,6 +198,8 @@ public void testDownloadSingleFile() {
         //Not logged in non-restricted
         Response anonDownloadOriginal = UtilIT.downloadFileOriginal(tabFile1Id);
         Response anonDownloadConverted = UtilIT.downloadFile(tabFile1Id);
+        Response anonDownloadConvertedNullKey = UtilIT.downloadFile(tabFile1Id, null);
+
         // ... and download the same tabular data file, but without the variable name header added:
         Response anonDownloadTabularNoHeader = UtilIT.downloadTabularFileNoVarHeader(tabFile1Id);
         // ... and download the same tabular file, this time requesting the "format=tab" explicitly:
@@ -206,6 +208,8 @@ public void testDownloadSingleFile() {
         assertEquals(OK.getStatusCode(), anonDownloadConverted.getStatusCode());
         assertEquals(OK.getStatusCode(), anonDownloadTabularNoHeader.getStatusCode());
         assertEquals(OK.getStatusCode(), anonDownloadTabularWithFormatName.getStatusCode());
+        assertEquals(UNAUTHORIZED.getStatusCode(), anonDownloadConvertedNullKey.getStatusCode());
+        
         int origSizeAnon = anonDownloadOriginal.getBody().asByteArray().length;
         int convertSizeAnon = anonDownloadConverted.getBody().asByteArray().length;
         int tabularSizeNoVarHeader = anonDownloadTabularNoHeader.getBody().asByteArray().length;
@@ -423,10 +427,7 @@ private HashMap<String,ByteArrayOutputStream> readZipResponse(InputStream iStrea
                 }
 
                 String name = entry.getName(); 
-//                String s = String.format("Entry: %s len %d added %TD",
-//                                entry.getName(), entry.getSize(),
-//                                new Date(entry.getTime()));
-//                System.out.println(s);
+
 
                 // Once we get the entry from the zStream, the zStream is
                 // positioned read to read the raw data, and we keep
@@ -466,7 +467,7 @@ private HashMap<String,ByteArrayOutputStream> readZipResponse(InputStream iStrea
     
     @Test
     public void testRequestAccess() throws InterruptedException {
-
+    
         String pathToJsonFile = "scripts/api/data/dataset-create-new.json";
         Response createDatasetResponse = UtilIT.createDatasetViaNativeApi(dataverseAlias, pathToJsonFile, apiToken);
         createDatasetResponse.prettyPrint();