diff --git a/CHANGELOG.md b/CHANGELOG.md
index 82ca0b436..1ca53ba5e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,7 +2,7 @@
 All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
-# [8.11.0] - 2024-09-24
+# [8.11.0] - 2024-09-25
 - Added custom user agent property setting to `HttpConfig`
 - Added RCS channel to Messages API
 - Added `ackInboundMessage` and `revokeOutboundMessage` methods to `MessagesClient`
diff --git a/src/main/java/com/vonage/client/messages/MessagesClient.java b/src/main/java/com/vonage/client/messages/MessagesClient.java
index 66ea048e1..637d7f15e 100644
--- a/src/main/java/com/vonage/client/messages/MessagesClient.java
+++ b/src/main/java/com/vonage/client/messages/MessagesClient.java
@@ -121,7 +121,7 @@ public MessagesClient useRegularEndpoint() {
 	 * Marks an inbound message as "read". Currently, this only applies to WhatsApp messages.
 	 *
 	 * @param messageId UUID of the message to acknowledge.
-	 * @param region (OPTIONAL) The regional server to use for this request.
+	 * @param region The regional server to use for this request. This must match the region of the message.
 	 *
 	 * @throws MessageResponseException If the acknowledgement fails. This could be for the following reasons:
 	 * <ul>
@@ -142,7 +142,7 @@ public void ackInboundMessage(String messageId, ApiRegion region) throws Message
 	 * Revokes an outbound message. Currently, this only applies to RCS messages.
 	 *
 	 * @param messageId UUID of the message to revoke.
-	 * @param region (OPTIONAL) The regional server to use for this request.
+	 * @param region The regional server to use for this request. This must match the region of the message.
 	 *
 	 * @throws MessageResponseException If the acknowledgement fails. This could be for the following reasons:
 	 * <ul>
@@ -156,7 +156,7 @@ public void ackInboundMessage(String messageId, ApiRegion region) throws Message
 	 * @since 8.11.0
 	 */
 	public void revokeOutboundMessage(String messageId, ApiRegion region) throws MessageResponseException {
-		updateMessage.execute(new UpdateStatusRequest("revoke", messageId, region));
+		updateMessage.execute(new UpdateStatusRequest("revoked", messageId, region));
 	}
 
 	/**