diff --git a/chapter2_tutorials/launch/chapter2.launch b/chapter2_tutorials/launch/chapter2.launch
index 2b60a79..9eb8e4c 100644
--- a/chapter2_tutorials/launch/chapter2.launch
+++ b/chapter2_tutorials/launch/chapter2.launch
@@ -1,5 +1,5 @@
 <?xml version="1.0"?>
 <launch>
-	<node name ="chap2_example1_a" pkg="chapter2_tutorials" type="chap2_example1_a"/>
-	<node name ="chap2_example1_b" pkg="chapter2_tutorials" type="chap2_example1_b"/>
+	<node name ="chap2_example1_a" pkg="chapter2_tutorials" type="example1_a"/>
+	<node name ="chap2_example1_b" pkg="chapter2_tutorials" type="example1_b"/>
 </launch>