diff --git a/src/google/protobuf/compiler/python/generator.cc b/src/google/protobuf/compiler/python/generator.cc
index 41be7df..f1a2296 100644
--- a/src/google/protobuf/compiler/python/generator.cc
+++ b/src/google/protobuf/compiler/python/generator.cc
@@ -708,6 +708,7 @@
   }
 }
 
+// TODO: Remove python service code from opensource.
 void Generator::PrintServiceDescriptors() const {
   for (int i = 0; i < file_->service_count(); ++i) {
     PrintServiceDescriptor(*file_->service(i));