diff --git a/src/Scenery/newcache.cxx b/src/Scenery/newcache.cxx
index a7d1980e3..d17328a62 100644
--- a/src/Scenery/newcache.cxx
+++ b/src/Scenery/newcache.cxx
@@ -183,8 +183,6 @@ void FGNewCache::clear_cache() {
 bool FGNewCache::insert_tile( FGTileEntry *e ) {
     // register tile in the cache
     long tile_index = e->get_tile_bucket().gen_index();
-    // not needed if timestamps are updated in cull-callback
-    // e->set_timestamp(globals->get_sim_time_sec());
     tile_cache[tile_index] = e;
 
     return true;
diff --git a/src/Scenery/newcache.hxx b/src/Scenery/newcache.hxx
index 1e9297898..78a3eb6eb 100644
--- a/src/Scenery/newcache.hxx
+++ b/src/Scenery/newcache.hxx
@@ -104,8 +104,6 @@ public:
     inline FGTileEntry *get_tile( const long tile_index ) const {
 	const_tile_map_iterator it = tile_cache.find( tile_index );
 	if ( it != tile_cache.end() ) {
-	    // not needed if timestamps are updated in cull-callback
-	    // it->second->set_timestamp(globals->get_sim_time_sec());
 	    return it->second;
 	} else {
 	    return NULL;
diff --git a/src/Scenery/tileentry.cxx b/src/Scenery/tileentry.cxx
index ab06bf62f..2eab669aa 100644
--- a/src/Scenery/tileentry.cxx
+++ b/src/Scenery/tileentry.cxx
@@ -96,6 +96,8 @@ public:
 
 namespace
 {
+// Update the timestamp on a tile whenever it is in view.
+
 class TileCullCallback : public osg::NodeCallback
 {
 public: