diff --git a/requirements.txt b/requirements.txt
index 880e0029..dd5c464d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,7 @@
+# This file describes python dependencies for an intermediary 
+# build stage within the cmake pipeline. 
+# See CMakeLists.txt. We must fix protobuf broken code: 
+# Read https://github.com/cpcloud/protoletariat
+# and https://github.com/protocolbuffers/protobuf/issues/1491
 protobuf
 protoletariat