diff --git a/quic/core/http/http_decoder.h b/quic/core/http/http_decoder.h
index 2318a03..225941d 100644
--- a/quic/core/http/http_decoder.h
+++ b/quic/core/http/http_decoder.h
@@ -164,6 +164,9 @@
   // Parses the payload of a SETTINGS frame from |reader| into |frame|.
   bool ParseSettingsFrame(QuicDataReader* reader, SettingsFrame* frame);
 
+  // Returns the max frame size of a given |frame_type|.
+  QuicByteCount MaxFrameLength(uint8_t frame_type);
+
   // Visitor to invoke when messages are parsed.
   Visitor* visitor_;  // Unowned.
   // Current state of the parsing.