diff --git a/basics/upayloadformat.adoc b/basics/upayloadformat.adoc
index 6a5e02a..c9ff47b 100644
--- a/basics/upayloadformat.adoc
+++ b/basics/upayloadformat.adoc
@@ -26,6 +26,11 @@ The following table provides an overview of the payload formats supported by uPr
 |===
 |UPayloadFormat |MIME Type |Payload encoding
 
+| `UPAYLOAD_FORMAT_UNSPECIFIED`
+| N/A
+| Payload format was not specified so we cannot assume a format and automatically deserialize the payload, the client needs to know what payload format is,
+
+
 |`UPAYLOAD_FORMAT_PROTOBUF_WRAPPED_IN_ANY`
 |`application/x-protobuf`
 |The message payload *MUST* be the network byte order serialization of a `google.protobuf.Any` structure that contains the payload itself along with the schema URI indicating the (protobuf) type of the payload. 
diff --git a/up-core-api/uprotocol/v1/uattributes.proto b/up-core-api/uprotocol/v1/uattributes.proto
index a1bc693..66ff298 100644
--- a/up-core-api/uprotocol/v1/uattributes.proto
+++ b/up-core-api/uprotocol/v1/uattributes.proto
@@ -124,8 +124,7 @@ enum UPriority {
 
 // The format for the data stored in the UMessage.
 enum UPayloadFormat {
-    // Payload format was not is not set,
-    // per specification, assumption is UPAYLOAD_FORMAT_PROTOBUF_WRAPPED_IN_ANY
+    // Payload format was not specified.
     UPAYLOAD_FORMAT_UNSPECIFIED = 0;
 
     // Payload is an Any protobuf message that contains the packed payload