diff --git a/books/gophermap b/books/gophermap
index 54f2772..6992499 100644
--- a/books/gophermap
+++ b/books/gophermap
@@ -18,6 +18,7 @@ C
 
  Beej's Guide to C (WIP)
  Beej's Guide to Network Programming
+ Compilers: Principles, Techniques, and Tools
 
 Other