diff --git a/README.md b/README.md
index e72b27cf07..982242aa0b 100644
--- a/README.md
+++ b/README.md
@@ -69,9 +69,15 @@ The v4.x series includes [osm2pgsql lua transforms](https://github.com/openstree
 and a hstore column with all other tags, allowing use of more OpenStreetMap data. Users need
 to reload their databases, v3.x compatibility is not maintained.
 
-## Mapnik and CartoCSS update (v5.x)
+## Database schema change (v5.x)
 
-The v5.x series was triggered by an update to the required Mapnik and CartoCSS
+The v5.x series includes update Lua tag transforms.
+Linestring and polygon decisions have changed and a database reload is
+required for this update.
+
+## Mapnik and CartoCSS update (v6.x)
+
+The v6.x series was triggered by an update to the required Mapnik and CartoCSS
 versions.
 
 There are over [300 open requests][issues], some that have been open for years.