diff --git a/hack/krmFunctionBenchmark/.gitignore b/hack/krmFunctionBenchmark/.gitignore
new file mode 100644
index 000000000..f797ffc24
--- /dev/null
+++ b/hack/krmFunctionBenchmark/.gitignore
@@ -0,0 +1,3 @@
+node_modules
+dist
+example_tshirt/execfn/tshirt
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diff --git a/hack/krmFunctionBenchmark/readme.md b/hack/krmFunctionBenchmark/readme.md
index 98cb33286..e472c6dbc 100644
--- a/hack/krmFunctionBenchmark/readme.md
+++ b/hack/krmFunctionBenchmark/readme.md
@@ -16,4 +16,13 @@ The script will build the exec version of function via container and then run 10
 ```bash
 ./cleanup.sh
 ```
-Will remove the built exec version of the function. Add flag `--image` to remove the images that used to build exec function.
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+Will remove the built exec version of the function. Add flag `--image` to remove the images that used to build exec function.
+
+## Functions in the benchmark
+
+Two functions are used:
+
+ - `gcr.io/kustomize-functions/example-tshirt` ([link](https://github.com/kubernetes-sigs/kustomize/blob/master/functions/examples/injection-tshirt-sizes/image/main.go))
+ - `gcr.io/kpt-functions/label-namespace`	 ([link](https://github.com/GoogleContainerTools/kpt-functions-sdk/blob/master/ts/hello-world/src/label_namespace.ts))
+
+ `example-tshirt` is a Go function. `label-namespace` is a JS function. Both of them are used as transformers.
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