diff --git a/paddle/framework/lod_tensor.md b/paddle/framework/lod_tensor.md
index a9a1a113d13c789b30d67ca49e883ae3c08d80b3..8dfe3ee823084cb8c38550a82e761a741eabe135 100644
--- a/paddle/framework/lod_tensor.md
+++ b/paddle/framework/lod_tensor.md
@@ -1,4 +1,4 @@
-# LoD (Level-of-Detail) Tensor
+# Design Doc: LoD (Level-of-Detail) Tensor
 
 PaddlePaddle's RNN doesn't require that all instances have the same length.  To do so, we introduce an extension to Tensor, namely, LoD Tensor.