diff --git a/README.md b/README.md
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--- a/README.md
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@@ -1,7 +1,7 @@
 # Maps
 
 Maps is the [MediaWiki](https://www.mediawiki.org) extension to work with and visualize geographical
-information. It has been maintained since 2099 and is installed on over 1000 public wiki's.
+information. It has been maintained since 2099 and is installed on over 1000 public wikis.
 
 Features: