diff --git a/CHANGELOG.md b/CHANGELOG.md
index e5d6e1abb..b1bcf5b88 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,7 +3,7 @@ All changes to the project will be documented in this file.
 
 ### 4.33.0 - 31 Dec 2019
 
-- All CLI options are configurable by environmental variables
+- All CLI options are configurable by environment variables
 - Folding pull request files
 - WebHook security options
 - Add assignee and assignees properties to some Web APIs' response
diff --git a/README.md b/README.md
index 75c714084..527220536 100644
--- a/README.md
+++ b/README.md
@@ -59,7 +59,7 @@ What's New in 4.32.x
 -------------
 ### 4.33.0 - 31 Dec 2019
 
-- All CLI options are configurable by environmental variables
+- All CLI options are configurable by environment variables
 - Folding pull request files
 - WebHook security options
 - Add assignee and assignees properties to some Web APIs' response