Get user agent right
diff --git a/tools/doxygen/Doxyfile.c++.internal b/tools/doxygen/Doxyfile.c++.internal
index a55e905..04e8f4e 100644
--- a/tools/doxygen/Doxyfile.c++.internal
+++ b/tools/doxygen/Doxyfile.c++.internal
@@ -877,6 +877,7 @@
src/cpp/common/core_codegen.cc \
src/cpp/common/resource_quota_cc.cc \
src/cpp/common/rpc_method.cc \
+src/cpp/common/version_cc.cc \
src/cpp/server/async_generic_service.cc \
src/cpp/server/create_default_thread_pool.cc \
src/cpp/server/dynamic_thread_pool.cc \