diff --git a/README.md b/README.md
index 98228bb..90390aa 100644
--- a/README.md
+++ b/README.md
@@ -38,7 +38,7 @@ transformer(
   // profile path is required
   hermesCpuProfilePath,
   // source maps are optional
-  sourceMap,
+  sourceMapPath,
   sourceMapBundleFileName
 )
   .then(events => {