diff --git a/tidy.Rmd b/tidy.Rmd
index fc5fc0c..48ce5ca 100644
--- a/tidy.Rmd
+++ b/tidy.Rmd
@@ -133,7 +133,7 @@ To tidy a dataset like this, we need to __gather__ those column into a new pair
   the `key`, and here it is `year`.
 
 * The name of the variable whose values are spread over the cells. I call 
-  that `value`. and here it's the number of `cases`.
+  that `value`, and here it's the number of `cases`.
   
 Together those parameters generate the call to `gather()`: