Add comments where required.

deb/graph.go

@@ -6,6 +6,7 @@ import (
 	"strings"
 )
 
+// BuildGraph generates graph contents from aptly object database
 func BuildGraph(collectionFactory *CollectionFactory) (gographviz.Interface, error) {
 	var err error
 

deb/snapshot.go

@@ -297,6 +297,7 @@ func (collection *SnapshotCollection) ForEach(handler func(*Snapshot) error) err
 	return err
 }
 
+// ForEachSorted runs method for each snapshot following some sort order
 func (collection *SnapshotCollection) ForEachSorted(sortMethod string, handler func(*Snapshot) error) error {
 	sorter, err := newSnapshotSorter(sortMethod, collection)
 	if err != nil {