diff --git a/pkg/ottl/ottlfuncs/README.md b/pkg/ottl/ottlfuncs/README.md
index 588de0da9c2a..ce970b69f79c 100644
--- a/pkg/ottl/ottlfuncs/README.md
+++ b/pkg/ottl/ottlfuncs/README.md
@@ -173,6 +173,9 @@ Examples:
 - `flatten(cache, "k8s", 4)`
 
 
+- `flatten(body, depth=2)`
+
+
 ### keep_keys
 
 `keep_keys(target, keys[])`