diff --git a/tidy.Rmd b/tidy.Rmd
index 3e1189f..0a4a1ef 100644
--- a/tidy.Rmd
+++ b/tidy.Rmd
@@ -131,7 +131,7 @@ A common problem is a dataset where some of the column names are not names of va
 table4a
 ```
 
-To tidy a dataset like this, we need to __gather__ those column into a new pair of variables. To describe that operation we need three parameters:
+To tidy a dataset like this, we need to __gather__ those columns into a new pair of variables. To describe that operation we need three parameters:
 
 * The set of columns that represent values, not variables. In this example, 
   those are the columns `1999` and `2000`.