diff --git a/doc/index.rst b/doc/index.rst
index c87cdb2c4..a2ae9bbd3 100644
--- a/doc/index.rst
+++ b/doc/index.rst
@@ -21,17 +21,17 @@ Contents
   tutorials/index
   faq
   XGBoost User Forum <https://discuss.xgboost.ai>
-  GPU support <gpu/index>
+  GPU Support <gpu/index>
   parameter
   prediction
   treemethod
-  Python package <python/index>
-  R package <R-package/index>
-  JVM package <jvm/index>
-  Ruby package <https://github.com/ankane/xgb>
-  Swift package <https://github.com/kongzii/SwiftXGBoost>
-  Julia package <julia>
+  Python Package <python/index>
+  R Package <R-package/index>
+  JVM Package <jvm/index>
+  Ruby Package <https://github.com/ankane/xgb>
+  Swift Package <https://github.com/kongzii/SwiftXGBoost>
+  Julia Package <julia>
   C Package <c>
   C++ Interface <c++>
-  CLI interface <cli>
+  CLI Interface <cli>
   contrib/index