diff --git a/config/source/memory/README.md b/config/source/memory/README.md
index 2c8038d8..7f1a4008 100644
--- a/config/source/memory/README.md
+++ b/config/source/memory/README.md
@@ -27,7 +27,7 @@ Specify source with data
 
 ```go
 memorySource := memory.NewSource(
-	memory.WithData(data),
+	memory.WithJSON(data),
 )
 ```