diff --git a/chp5_physicslibraries/readme.txt b/chp5_physicslibraries/readme.txt
index 99d3a27a..dd814d42 100644
--- a/chp5_physicslibraries/readme.txt
+++ b/chp5_physicslibraries/readme.txt
@@ -1,3 +1,3 @@
-For the box2d examples you will need PBox2D!
+For the box2d examples you will need Box2D For Processing!
 
-https://github.com/shiffman/PBox2D
\ No newline at end of file
+https://github.com/shiffman/Box2D-for-Processing/