diff --git a/slide_r_elements_4.Rmd b/slide_r_elements_4.Rmd
index cf9c854..355b925 100644
--- a/slide_r_elements_4.Rmd
+++ b/slide_r_elements_4.Rmd
@@ -39,8 +39,8 @@ name: contents
 - operators
 - vectors
 - matrices
-- lists
 - data frames
+- lists
 - **repeating actions: loops**
 - **decision taking: `if` control structures**
 - **functions**