diff --git a/CHANGELOG.md b/CHANGELOG.md
index d1aa6d804..f38b993af 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1682,7 +1682,7 @@
   * Break: Removed support for lock files created before 2012-09-15 due to their outdated unusable format
   * Added `prefer-stable` flag to pick stable packages over unstable ones when possible
   * Added `preferred-install` config option to always enable --prefer-source or --prefer-dist
-  * Added `diagnose` command to to system/network checks and find common problems
+  * Added `diagnose` command to system/network checks and find common problems
   * Added wildcard support in the update whitelist, e.g. to update all packages of a vendor do `composer update vendor/*`
   * Added `archive` command to archive the current directory or a given package
   * Added `run-script` command to manually trigger scripts
diff --git a/UPGRADE-2.0.md b/UPGRADE-2.0.md
index 3e5878ea3..99c2876cf 100644
--- a/UPGRADE-2.0.md
+++ b/UPGRADE-2.0.md
@@ -100,7 +100,7 @@ If your repository only has a small number of packages, and you want to avoid th
 
 `"providers-api": "https://packagist.org/providers/%package%.json",`
 
-The providers-api is optional, but if you implement it it should return packages which provide a given package name, but not the package which has that name. For example https://packagist.org/providers/monolog/monolog.json lists some package which have a "provide" rule for monolog/monolog, but it does not list monolog/monolog itself.
+The providers-api is optional, but if you implement it, it should return packages which provide a given package name, but not the package which has that name. For example https://packagist.org/providers/monolog/monolog.json lists some package which have a "provide" rule for monolog/monolog, but it does not list monolog/monolog itself.
 
 ### list