diff --git a/doc/src/Regression/Regression.do.txt b/doc/src/Regression/Regression.do.txt
index 150c28ae8..28a18dd90 100644
--- a/doc/src/Regression/Regression.do.txt
+++ b/doc/src/Regression/Regression.do.txt
@@ -13,6 +13,7 @@ DATE: today
 * add material on ridge and lasso and link to SVD, show proofs
 * clean up math formalism, hats to boldface
 * add material about kernel regression
+* rewrite CV part and add discussion of train, validate and test
 
 !split
 ===== Why Linear Regression (aka Ordinary Least Squares and family) =====