diff --git a/demo/kaggle-otto/readme.md b/demo/kaggle-otto/readme.md
index 265ebf1d2..af95dd47a 100644
--- a/demo/kaggle-otto/readme.md
+++ b/demo/kaggle-otto/readme.md
@@ -14,7 +14,7 @@ The parameter `nthread` controls the number of cores to run on, please set it to
 
 To install the R-package of xgboost, please run
 
-```
+```r
 devtools::install_github('tqchen/xgboost',subdir='R-package')
 ```