--- a/pkg/mesh/meshserialize.go	Mon Feb 12 14:43:31 2024 +0100
+++ b/pkg/mesh/meshserialize.go	Mon Feb 12 21:23:55 2024 +0100
@@ -24,10 +24,13 @@
 	"gemma.intevation.de/gemma/pkg/log"
 )
 
-const Version = 1
+// Version is current version of the format the mesh index is stored in.
+const Version = 2
 
+// magicHeader is a magic header to tell if the data blob is a mesh index.
 const magicHeader = "SR3D"
 
+// coalesceVersion returns the most recent version if version is less or equal zero.
 func coalesceVersion(version int) int {
 	if version > 0 {
 		return version
@@ -35,6 +38,8 @@
 	return Version
 }
 
+// OptimizeForSerialization apply version specific storage optimizations
+// before serialization.
 func (s *STRTree) OptimizeForSerialization(version int) {
 	version = coalesceVersion(version)
 	if version == 2 {
@@ -44,22 +49,18 @@
 
 // Bytes serializes this tree to a byte slice.
 func (s *STRTree) Bytes(version int) ([]byte, int, error) {
-
 	var buf bytes.Buffer
 	w, err := gzip.NewWriterLevel(&buf, gzip.BestSpeed)
 	if err != nil {
 		return nil, 0, err
 	}
-
 	version = coalesceVersion(version)
 	if err := s.serializeVn(w, version); err != nil {
 		return nil, 0, err
 	}
-
 	if err := w.Close(); err != nil {
 		return nil, 0, err
 	}
-
 	return buf.Bytes(), version, nil
 }
 
@@ -85,12 +86,10 @@
 }
 
 func (s *STRTree) deserialize(r *bufio.Reader, version int) error {
-
 	header, err := r.Peek(8)
 	if err != nil {
 		return err
 	}
-
 	if bytes.HasPrefix(header, []byte(magicHeader)) {
 		realVersion := int(binary.LittleEndian.Uint32(header[4:]))
 		if realVersion != version {
@@ -103,7 +102,6 @@
 		}
 		return s.deserializeVn(r, realVersion)
 	}
-
 	return s.deserializeV1(r)
 }
 
@@ -119,7 +117,7 @@
 }
 
 // serializer is a generic function to apply a chain of
-// serializer/deserializer functions to an object given a reader.
+// serializer/deserializer functions to an object given a reader or writer.
 func serializer[T, S any](
 	s S,
 	t T,