diff --git a/data-tidy.qmd b/data-tidy.qmd
index b682c57..ad15a8e 100644
--- a/data-tidy.qmd
+++ b/data-tidy.qmd
@@ -43,7 +43,7 @@ From this chapter on, we'll suppress the loading message from `library(tidyverse
 
 You can represent the same underlying data in multiple ways.
 The example below shows the same data organised in four different ways.
-Each dataset shows the same values of four variables: *country*, *year*, *population*, and *cases*, but each dataset organizes the values in a different way.
+Each dataset shows the same values of four variables: *country*, *year*, *population*, and *cases* of TB (tuberculosis), but each dataset organizes the values in a different way.
 
 <!-- TODO redraw as tables -->
 
@@ -140,7 +140,7 @@ ggplot(table1, aes(year, cases)) +
     c.  Divide cases by population, and multiply by 10000.
     d.  Store back in the appropriate place.
 
-    You haven't yet learned all the functions you'd need to actual perform these operations, but you should still be able to think through the transformations you'd need.
+    You haven't yet learned all the functions you'd need to actually perform these operations, but you should still be able to think through the transformations you'd need.
 
 3.  Recreate the plot showing change in cases over time using `table2` instead of `table1`.
     What do you need to do first?