Clean up data documentation

Change-Id: I630f5c09400b0edc88e2a6af524b66aed84c13c4
diff --git a/Changes b/Changes
index 9d5509f..511c3dc 100755
--- a/Changes
+++ b/Changes
@@ -13,6 +13,7 @@
           configuration option 'experimental_proxy'.
         - Updated documentation on annotations.
         - Introduced documentation on Annis QL (margaretha).
+        - Improved documentation on data.
 
 0.34 2019-06-26
         - Introduced guided tour (hebasta, #19).