diff --git a/tools/doxygen/Doxyfile.c++ b/tools/doxygen/Doxyfile.c++
index ebe8a56..0f36810 100644
--- a/tools/doxygen/Doxyfile.c++
+++ b/tools/doxygen/Doxyfile.c++
@@ -769,6 +769,7 @@
 include/grpc++/grpc++.h \
 include/grpc++/impl/call.h \
 include/grpc++/impl/client_unary_call.h \
+include/grpc++/impl/codegen/server_interface.h include/grpc++/impl/codegen/channel_interface.h \
 include/grpc++/impl/grpc_library.h \
 include/grpc++/impl/method_handler_impl.h \
 include/grpc++/impl/proto_utils.h \
diff --git a/tools/doxygen/Doxyfile.c++.internal b/tools/doxygen/Doxyfile.c++.internal
index b9961c0..a001370 100644
--- a/tools/doxygen/Doxyfile.c++.internal
+++ b/tools/doxygen/Doxyfile.c++.internal
@@ -769,6 +769,7 @@
 include/grpc++/grpc++.h \
 include/grpc++/impl/call.h \
 include/grpc++/impl/client_unary_call.h \
+include/grpc++/impl/codegen/server_interface.h include/grpc++/impl/codegen/channel_interface.h \
 include/grpc++/impl/grpc_library.h \
 include/grpc++/impl/method_handler_impl.h \
 include/grpc++/impl/proto_utils.h \