Add files
diff --git a/tools/doxygen/Doxyfile.c++.internal b/tools/doxygen/Doxyfile.c++.internal
index 04e8f4e..f2e871e 100644
--- a/tools/doxygen/Doxyfile.c++.internal
+++ b/tools/doxygen/Doxyfile.c++.internal
@@ -766,6 +766,8 @@
include/grpc++/completion_queue.h \
include/grpc++/create_channel.h \
include/grpc++/create_channel_posix.h \
+include/grpc++/ext/health_check_service_interface.h \
+include/grpc++/ext/health_check_service_server_builder_option.h \
include/grpc++/generic/async_generic_service.h \
include/grpc++/generic/generic_stub.h \
include/grpc++/grpc++.h \