diff --git a/docs/performance/tune-performance/threading.md b/docs/performance/tune-performance/threading.md
index 18620eb4add9f..b82c391c460de 100644
--- a/docs/performance/tune-performance/threading.md
+++ b/docs/performance/tune-performance/threading.md
@@ -201,5 +201,6 @@ int main() {
 
 Note that `CreateThreadCustomized` and `JoinThreadCustomized`, once  set, will be applied to both ORT intra op and inter op thread pools uniformly.
 
-
-
+## Usage in custom ops
+Since 1.17, custom op developers are entitled to accelerate their code on cpu with ort intra-op thread pool.
+Please see the API and example for usage.
\ No newline at end of file
diff --git a/docs/reference/operators/add-custom-op.md b/docs/reference/operators/add-custom-op.md
index 0cb3626efb38f..727fae2a3b491 100644
--- a/docs/reference/operators/add-custom-op.md
+++ b/docs/reference/operators/add-custom-op.md
@@ -134,6 +134,7 @@ void KernelOne(const Ort::Custom::CudaContext& cuda_ctx,
 }
 ```
 Details could be found [here](https://github.com/microsoft/onnxruntime/tree/rel-1.16.0/onnxruntime/test/testdata/custom_op_library/cuda).
+To facilitate the development, a wide variety of cuda ep resources/configurations are exposed via CudaContext, please see the header and usage for detail.
 
 For ROCM, it is like: