diff --git a/paddle/operators/name_convention.md b/paddle/operators/name_convention.md
index da5bcb7485ba89a42b9b39af758e97c016f38cfb..2260bf5660fa583702ba2931fa8a6c0410c64408 100644
--- a/paddle/operators/name_convention.md
+++ b/paddle/operators/name_convention.md
@@ -4,8 +4,12 @@ To make the operator document itself more clear. we recommend operator names obs
 
 ### Input/Output names
 
-Variable name is uppercase. e.g. `X`, `Y`
+* Variable name is prefer uppercase. e.g. `X`, `Y`. But when the variable is tensor, its name should lowercase. e.g. `matrix`, to discriminate with otherone.
 
-Tensor name is lowercase. e.g. `tensor`
+* element wise operator, math operator or similar op, please obey common name convention. if the operator only have one output, use `Out`.
 
-if only have one output, use `Out`
+* we prefer more meaningful input/output name. 
+
+### Best Practice
+e.g. `rowwise_add`, inputs : `X`, `Y`, outputs : `Out`
+e.g. `cosine` , inputs : `X`, `axis`, outputs : `Out`