diff --git a/rfcs/testdriver_set_time_zone.md b/rfcs/testdriver_set_time_zone.md
index b7db43fd..6ea99ca2 100644
--- a/rfcs/testdriver_set_time_zone.md
+++ b/rfcs/testdriver_set_time_zone.md
@@ -2,13 +2,13 @@
 
 ## Summary
 Add testdriver.js support for the `timeZone` WebDriver extension, which will
-allow setting the current timezone in the browser. This extension is specced as
-part of the [HTML spec](https://github.com/whatwg/html/pull/3047).
+allow setting the current time zone in the browser. This extension is specced
+as part of the [HTML spec](https://github.com/whatwg/html/pull/3047).
 
 ## Details
-Changing the timezone is not available via normal web APIs. To test the effect
-of changing timezone on the `ontimezonechange` event there needs to be a way to
-instruct the browser to act as if the timezone is changing: this WebDriver
+Changing the time zone is not available via normal web APIs. To test the effect
+of changing time zone on the `ontimezonechange` event there needs to be a way
+to instruct the browser to act as if the time zone is changing: this WebDriver
 extension provides that ability.
 
 ## Risks