diff --git a/doc/design/layers_operators.md b/doc/design/layers_operators.md
index 4cb590c85f976d75c2ca575f2b5ba52303e8badf..83169260c8f5f6c511d850b96128c34c7e6d2798 100644
--- a/doc/design/layers_operators.md
+++ b/doc/design/layers_operators.md
@@ -1,3 +1,5 @@
+# Design Doc: Layers and Operators
+
 In a DL system, we can compose one or more fine grained operators into a coarse grained one.  For example, the FC layer can be composed of a multiplication operator and an add operator.
 
 Historically, some fine grained operations are known as operators, and some coarse level ones are known as layers.  But we need a well-defined separation.