Go Oracle is now Go Guru
diff --git a/CodeTools.md b/CodeTools.md
index 0f2f75a..4eb0da3 100644
--- a/CodeTools.md
+++ b/CodeTools.md
@@ -55,8 +55,8 @@
## Navigation
- - [go oracle - user manual](http://golang.org/s/oracle-user-manual) - A tool for understanding Go code
- - [Pythia](https://github.com/fzipp/pythia) - A browser-based UI for the Go Oracle.
+ - [Go Guru - User Manual](https://golang.org/s/using-guru) - A tool for understanding Go code.
+ - [Pythia](https://github.com/fzipp/pythia) - A browser-based UI for Go Guru.
## Visualization