Comment clarification

Author: mfeingold

src/modules/misc/viewport.js

@@ -137,7 +137,7 @@ export default function Viewport(elementRoutines, buffer, element, controllers,
 				return;
 			}
 
-			// precise heights calculation, items that were in buffer once
+			// precise heights calculation, items that were in buffer at some point
 			let topPaddingHeight = 0;
 			let bottomPaddingHeight = 0;
 
@@ -207,4 +207,4 @@ export default function Viewport(elementRoutines, buffer, element, controllers,
 	});
 
 	return viewport;
-}
+}