diff --git a/docs/preset-typescript.md b/docs/preset-typescript.md
index d213c06876..c00099c286 100644
--- a/docs/preset-typescript.md
+++ b/docs/preset-typescript.md
@@ -50,9 +50,12 @@ babel --presets @babel/preset-typescript script.ts
 
 ### Via Node API
 
+Need a filename with ts or tsx suffix
+
 ```javascript
 require("@babel/core").transform("code", {
   presets: ["@babel/preset-typescript"],
+  filename: "example.ts"
 });
 ```
 
diff --git a/website/versioned_docs/version-7.0.0/preset-typescript.md b/website/versioned_docs/version-7.0.0/preset-typescript.md
index 997385d6ab..ba43b52e58 100644
--- a/website/versioned_docs/version-7.0.0/preset-typescript.md
+++ b/website/versioned_docs/version-7.0.0/preset-typescript.md
@@ -51,9 +51,12 @@ babel --presets @babel/preset-typescript script.ts
 
 ### Via Node API
 
+Need a filename with ts or tsx suffix
+
 ```javascript
 require("@babel/core").transform("code", {
   presets: ["@babel/preset-typescript"],
+  filename: "example.ts"
 });
 ```