diff --git a/api/data_channel_interface.h b/api/data_channel_interface.h
index e08830f..5b2b126 100644
--- a/api/data_channel_interface.h
+++ b/api/data_channel_interface.h
@@ -20,6 +20,7 @@
 #include <string>
 
 #include "absl/types/optional.h"
+#include "api/priority.h"
 #include "api/rtc_error.h"
 #include "rtc_base/checks.h"
 #include "rtc_base/copy_on_write_buffer.h"
@@ -61,6 +62,9 @@
 
   // The stream id, or SID, for SCTP data channels. -1 if unset (see above).
   int id = -1;
+
+  // https://w3c.github.io/webrtc-priority/#new-rtcdatachannelinit-member
+  absl::optional<Priority> priority;
 };
 
 // At the JavaScript level, data can be passed in as a string or a blob, so
@@ -154,6 +158,7 @@
   // If negotiated in-band, this ID will be populated once the DTLS role is
   // determined, and until then this will return -1.
   virtual int id() const = 0;
+  virtual Priority priority() const { return Priority::kLow; }
   virtual DataState state() const = 0;
   // When state is kClosed, and the DataChannel was not closed using
   // the closing procedure, returns the error information about the closing.