diff --git a/README.md b/README.md
index a0c16a887a..f62e8dcae8 100644
--- a/README.md
+++ b/README.md
@@ -32,7 +32,7 @@ For example, let's say we want to capitalize all of the letters of "art vandlay"
 "art vandelay" # "ART VANDELAY"
 ```
 
-Notice that there is no output below the gray code above.  This is because Jupyter notebooks do not automatically run our code - so they do not automatically know the output.  To display the output, we must **run** the code by clicking on the gray cell and then pressing shift + enter.  Let's try it in the cell above and see our output appear below.
+Notice that there is no output below the gray code above.  This is because Jupyter notebooks do not automatically run our code - so they do not automatically know the output.  To display the output, we must **run** the code by clicking on the gray cell and then pressing shift + enter (control + enter on macOS).  Let's try it in the cell above and see our output appear below.
 
 Ok, once we see the output take a look at the cell below with the hash tag to the right of the string, `'hello'`.  This is a comment like the above.  Comments are used for programmers to annotate their code, but a comment has no impact on the code.  We can see this by running the cell below (again, press shift + enter).