diff --git a/RELEASE_NOTES.txt b/RELEASE_NOTES.txt
index 13d88258ef..efe40b87ab 100644
--- a/RELEASE_NOTES.txt
+++ b/RELEASE_NOTES.txt
@@ -1,3 +1,16 @@
+Release 5.4-alpha1
+------------------
+
+This is the first release in the 5.4 release series.
+ 
+
+Change Log
+-------------------
+
+* Add ContentType.APPLICATION_ZIP_COMPRESSED.
+  Contributed by Gary Gregory <ggregory at apache.org>
+
+
 Release 5.3
 ------------------
 
diff --git a/httpcore5/src/main/java/org/apache/hc/core5/http/ContentType.java b/httpcore5/src/main/java/org/apache/hc/core5/http/ContentType.java
index b8e049961a..b7abdff1d9 100644
--- a/httpcore5/src/main/java/org/apache/hc/core5/http/ContentType.java
+++ b/httpcore5/src/main/java/org/apache/hc/core5/http/ContentType.java
@@ -75,6 +75,17 @@ public final class ContentType implements Serializable {
     public static final ContentType APPLICATION_JSON = create(
             "application/json", StandardCharsets.UTF_8);
 
+    /**
+     * Public constant media type for ZIP archives {@code application/x-zip-compressed}.
+     * <p>
+     * Note that Windows uploads {@code .zip} files with this non-standard MIME type.
+     * </p>
+     *
+     * @see <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/MIME_types/Common_types">ZIP archive application/x-zip-compressed</a>
+     * @since 5.4
+     */
+    public static final ContentType APPLICATION_ZIP_COMPRESSED = create("application/x-zip-compressed");
+
     /**
      * Public constant media type for {@code application/x-ndjson}.
      * @since 5.1
diff --git a/httpcore5/src/test/java/org/apache/hc/core5/http/TestContentType.java b/httpcore5/src/test/java/org/apache/hc/core5/http/TestContentType.java
index cea1eae592..c0e5c00f80 100644
--- a/httpcore5/src/test/java/org/apache/hc/core5/http/TestContentType.java
+++ b/httpcore5/src/test/java/org/apache/hc/core5/http/TestContentType.java
@@ -40,6 +40,14 @@
  */
 class TestContentType {
 
+    @Test
+    void testApplicationZipCompressed() {
+        final ContentType contentType = ContentType.create("application/x-zip-compressed");
+        Assertions.assertEquals(contentType.toString(), ContentType.APPLICATION_ZIP_COMPRESSED.toString());
+        Assertions.assertTrue(contentType.isSameMimeType(ContentType.APPLICATION_ZIP_COMPRESSED));
+        Assertions.assertTrue(ContentType.APPLICATION_ZIP_COMPRESSED.isSameMimeType(contentType));
+    }
+
     @Test
     void testBasis() throws Exception {
         final ContentType contentType = ContentType.create("text/plain", "US-ASCII");