diff --git a/g/container/gbtree/gbtree.go b/g/container/gbtree/gbtree.go
index 5bf90fc97..3547d849c 100644
--- a/g/container/gbtree/gbtree.go
+++ b/g/container/gbtree/gbtree.go
@@ -1,6 +1,6 @@
 // from https://github.com/google/btree
 
-// B+ Tree
+// B-Tree
 package gbtree
 
 import (