diff --git a/demo/README.md b/demo/README.md
index 433324947..f5606aff1 100644
--- a/demo/README.md
+++ b/demo/README.md
@@ -14,10 +14,10 @@ Start Examples by Tasks
 Features Walkthrough
 ====
 This is a list of short codes introducing different functionalities of xgboost and its wrapper.
-* Basic walkthrough of wrappers. [python](guide-python/basic_walkthrough.py) [R](guide-R/basic_walkthrough.R) 
-* Cutomize loss function, and evaluation metric. [python](guide-python/custom_objective.py) [R](guide-R/custom_objective.R)
-* Boosting from existing prediction. [python](guide-python/boost_from_prediction.py) [R](guide-R/boost_from_prediction.R) 
-* Predicting using first n trees. [python](guide-python/predict_first_ntree.py) [R](guide-R/predict_first_ntree.R)
+* Basic walkthrough of wrappers. [python](guide-python/basic_walkthrough.py)
+* Cutomize loss function, and evaluation metric. [python](guide-python/custom_objective.py)
+* Boosting from existing prediction. [python](guide-python/boost_from_prediction.py)
+* Predicting using first n trees. [python](guide-python/predict_first_ntree.py)
 * Cross validation(to come)
 
 Benchmarks