diff --git a/api/datachannelinterface.h b/api/datachannelinterface.h
index 85e6fa6..5cbe717 100644
--- a/api/datachannelinterface.h
+++ b/api/datachannelinterface.h
@@ -23,7 +23,7 @@
 namespace webrtc {
 
 // C++ version of: https://www.w3.org/TR/webrtc/#idl-def-rtcdatachannelinit
-// TODO(deadbeef): Use rtc::Optional for the "-1 if unset" things.
+// TODO(deadbeef): Use absl::optional for the "-1 if unset" things.
 struct DataChannelInit {
   // Deprecated. Reliability is assumed, and channel will be unreliable if
   // maxRetransmitTime or MaxRetransmits is set.