diff --git a/include/clang/Driver/CC1Options.td b/include/clang/Driver/CC1Options.td
index 7e61b6c..c5d232a 100644
--- a/include/clang/Driver/CC1Options.td
+++ b/include/clang/Driver/CC1Options.td
@@ -228,6 +228,9 @@
   HelpText<"output a dump of some build information to a file">;
 def diagnostic_log_file : Separate<"-diagnostic-log-file">,
   HelpText<"Filename (or -) to log diagnostics to">;
+def diagnostic_serialized_file : Separate<"-diagnostic-serialized-file">,
+  MetaVarName<"<filename>">,
+  HelpText<"File for serializing diagnostics in a binary format">;
 def fno_show_column : Flag<"-fno-show-column">,
   HelpText<"Do not include column number on diagnostics">;
 def fshow_column : Flag<"-fshow-column">,