diff --git a/bramble-core/src/main/java/org/briarproject/bramble/mailbox/protocol/MailboxRequestHandler.java b/bramble-core/src/main/java/org/briarproject/bramble/mailbox/protocol/MailboxRequestHandler.java
index 18051b38e811feff777b40b39a8d951994d40dc7..4cd8b4593801c1dc1f132360a7fb64c061051555 100644
--- a/bramble-core/src/main/java/org/briarproject/bramble/mailbox/protocol/MailboxRequestHandler.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/mailbox/protocol/MailboxRequestHandler.java
@@ -11,6 +11,7 @@ public interface MailboxRequestHandler {
 	 * @param request
 	 * @throws ProtocolException If this function throws a Protocol exception,
 	 * an error response will be sent
+	 * NOTE: Ensure that the ProtocolException does not include sensitive information
 	 */
 	void handleRequest(MailboxRequest request) throws ProtocolException;