diff --git a/doc/YAOM.md b/doc/YAOM.md
index e957e67..cb89721 100644
--- a/doc/YAOM.md
+++ b/doc/YAOM.md
@@ -175,7 +175,7 @@ Removed and no longer exists. Remains may remain.
 The object is not this kind of feature or does not have this attribute any more.
 
 ## Data sources
-YAOM feeds from an increasing variety of sources. Parts of a dataset can be filtered out for specific areas, if there is better dataset for an area that is part of the first, bigger one.
+YAOM feeds from an increasing variety of sources. Parts of a dataset can be filtered out for specific areas, if there is a better dataset for an area that is part of the first, bigger one.
 
 Some examples of the worldwide features and source providers: