diff --git a/components/aap2/aap2.proto b/components/aap2/aap2.proto
index 37442d5..969ceb7 100644
--- a/components/aap2/aap2.proto
+++ b/components/aap2/aap2.proto
@@ -162,10 +162,10 @@ message BundleADU {
   string report_to_eid = 7;
 
   // The bundle creation time in milliseconds since the DTN epoch as defined
-  // in RFC 9171. Optional when sending bundles (will be assigned by µD3TN).
+  // in RFC 9171. Ignored when sending bundles (will be assigned by µD3TN).
   uint64 creation_timestamp_ms = 3;
   // The bundle sequence number as defined in RFC 9171.
-  // Optional when sending bundles (will be assigned by µD3TN).
+  // Ignored when sending bundles (will be assigned by µD3TN).
   uint64 sequence_number = 4;
 
   // The number of bytes contained in the bundle payload, which MUST be