Resolve issue from feedback for 1417363004

chrome/browser/local_discovery/privet_http.h

Index: chrome/browser/local_discovery/privet_http.h
diff --git a/chrome/browser/local_discovery/privet_http.h b/chrome/browser/local_discovery/privet_http.h
index 2cbd5ceb489b1dbd15124d1c7db05bb116040797..0786cbdc08858468211098b070b1b81fa151fb6e 100644
--- a/chrome/browser/local_discovery/privet_http.h
+++ b/chrome/browser/local_discovery/privet_http.h
@@ -63,8 +63,16 @@ class PrivetHTTPClient {
   virtual void RefreshPrivetToken(
       const PrivetURLFetcher::TokenCallback& token_callback) = 0;
 
-  // After this call HTTPS will be used. Only requests to the server with
+  // After this call only HTTPS will be used. Only requests to the server with
   // matching certificate will be allowed.
+  // Privet v3 devices MUST support HTTPS. Before communicating over HTTPS,
+  // Privet v3 pairing generates a shared secret using SPAKE2 over an
+  // unauthenticated channel. This shared secret is used to then authenticate
+  // the fingerprint of a certificate, which is self-signed. The client then
+  // validates that the HTTPS peer is sending a certificate matching that
+  // fingerprint.
+  // For more information on this protocol:
+  // https://developers.google.com/cloud-devices/v1/reference/local-api/pairing_start
   virtual void SwitchToHttps(
       uint16_t port,
       const net::SHA256HashValue& certificate_fingerprint) = 0;