diff --git a/workflow-basics.Rmd b/workflow-basics.Rmd
index 1fcd8ed..645f05b 100644
--- a/workflow-basics.Rmd
+++ b/workflow-basics.Rmd
@@ -137,8 +137,8 @@ R_rocks
 ```
 
 This illustrates the implied contract between you and R: R will do the tedious computations for you, but in exchange, you must be completely precise in your instructions.
-Typos matter.
-Case matters.
+Typos matter; R can't read your mind and say "oh, they probably meant `r_rocks` when they typed `r_rock`".
+Case matters; similarly R can't read your mind and say "oh, they probably meant `r_rocks` when they typed `R_rocks`".
 
 ## Calling functions