--- a/pkg/octree/cache.go	Sun Dec 30 16:24:51 2018 +0100
+++ b/pkg/octree/cache.go	Mon Dec 31 11:13:49 2018 +0100
@@ -31,6 +31,9 @@
 		tree     *Tree
 		access   time.Time
 	}
+
+	// Cache holds Octrees for a defined amount of time in memory
+	// before they are released.
 	Cache struct {
 		sync.Mutex
 		entries map[cacheKey]*cacheEntry
@@ -87,6 +90,7 @@
 	}
 }
 
+// FromCache fetches an Octree from the global Octree cache.
 func FromCache(
 	ctx context.Context,
 	conn *sql.Conn,
@@ -135,7 +139,7 @@
 		}
 	}
 
-	tree, err := Deserialize(data)
+	tree, err := deserialize(data)
 	if err != nil {
 		return nil, err
 	}