diff --git a/session_4/session_4.Rmd b/session_4/session_4.Rmd
index 1e9a90568e8cd80a1f10b45aeeadd8da394b3c29..3a8955e7354f62ed50c753af97730b3950989226 100644
--- a/session_4/session_4.Rmd
+++ b/session_4/session_4.Rmd
@@ -489,6 +489,7 @@ To display only Brewer palettes that are colorblind friendly, specify the option
 ```{r colorblindBrewer}
 display.brewer.all(colorblindFriendly = TRUE)
 ```
+
 ## Viridis
 
 `viridis` package provide a series of color maps that are designed to improve graph readability for readers with common forms of color blindness and/or color vision deficiency.