diff --git a/doc/parameter.rst b/doc/parameter.rst
index 0a730c90a..a20f66426 100644
--- a/doc/parameter.rst
+++ b/doc/parameter.rst
@@ -96,7 +96,7 @@ Parameters for Tree Booster
     subsampled from the set of columns chosen for the current level.
   - ``colsample_by*`` parameters work cumulatively. For instance,
     the combination ``{'colsample_bytree':0.5, 'colsample_bylevel':0.5,
-    'colsample_bynode':0.5}`` with 64 features will leave 4 features to choose from at
+    'colsample_bynode':0.5}`` with 64 features will leave 8 features to choose from at
     each split.
 
 * ``lambda`` [default=1, alias: ``reg_lambda``]