diff --git a/doc/design/functions_operators_layers.md b/doc/design/functions_operators_layers.md
index 7a2e8fd0ace2e3f4462b15215de22c31e944b7cb..d23ba56b5773a36d448a99e4abdebc1475ed789c 100644
--- a/doc/design/functions_operators_layers.md
+++ b/doc/design/functions_operators_layers.md
@@ -86,12 +86,13 @@ def layer.fc(X):
 
 We'd like to have Python bindings to operators in package `paddle.operator`, and Python compositions of operators in package `paddle.layer`.  So we have the following concepts in above illustrative example:
 
-```
+
 | C++ functions/functors | mul          | add          |             |          |
+|------------------------|--------------|--------------|-------------|----------|
 | C++ operator class     | mulOp        | addOp        | FCOp        |          |
 | Python binding         | operator.mul | operator.add | operator.fc |          |
 | Python function        |              |              |             | layer.fc |
-```
+
 
 This is how we differentiate layer and operators in PaddlePaddle: