diff --git a/How_does_Lisp_work.md b/How_does_Lisp_work.md
index ca55ecb..42cb3de 100644
--- a/How_does_Lisp_work.md
+++ b/How_does_Lisp_work.md
@@ -1,6 +1,6 @@
 # How does Lisp work?
 
-This is from the book meta math!! I think it was explained really well. So how does it work? 
+This is from the book meta math by Gregory Chaitin!! I think it was explained really well. So how does it work? 
 
 ## LISP Style