diff --git a/docs/source_en/constraints_on_network_construction.md b/docs/source_en/constraints_on_network_construction.md
index 69345b9878d01d5ecdcea9a647e883cb71b00a16..04a26498b4b0e534c86fd75fecae48cde5080c55 100644
--- a/docs/source_en/constraints_on_network_construction.md
+++ b/docs/source_en/constraints_on_network_construction.md
@@ -55,7 +55,7 @@
 | Statement         | Compared with Python
 | :----------- |:--------
 | `for`        | Nested for loops are partially supported. Iteration sequences must be tuples or lists.
-| `while`      | Nested while loops are partially supported.
+| `while`      | Nested while loops are partially supported. Grad of net with while is not supported.
 | `if`         | Same as that in Python. The input of the `if` condition must be a constant.
 | `def`        | Same as that in Python.
 | `in`         | Only support Dictionary.