diff --git a/episodes/13-dplyr.Rmd b/episodes/13-dplyr.Rmd
index 2ab78a7b6..8e1331f21 100644
--- a/episodes/13-dplyr.Rmd
+++ b/episodes/13-dplyr.Rmd
@@ -23,7 +23,7 @@ source: Rmd
 gapminder <- read.csv("data/gapminder_data.csv", header = TRUE)
 ```
 
-Manipulation of data frames means many things to many researchers, we often
+Manipulation of data frames means many things to many researchers: we often
 select certain observations (rows) or variables (columns), we often group the
 data by a certain variable(s), or we even calculate summary statistics. We can
 do these operations using the normal base R operations: