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readme.md

@@ -60,6 +60,14 @@ await renderLottie({
 })
 ```
 
+#### Output Scaling
+
+If you pass `width` or `height`, the other dimension will be inferred by maintaining the original animation's aspect ratio.
+
+If both `width` and `height` are passed, the output will have those dimensions, but there will be extra whitespace (or transparency if rendering PNGs) due to `lottie-web`'s default `rendererSettings.preserveAspectRatio` of `xMidyMid meet` ([docs](https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/preserveAspectRatio) and [demo](https://codepen.io/giodif/pen/VYpaeo)).
+
+For `mp4` outputs, the height may be different by a pixel due to the `x264` encoder requiring even heights.
+
 ## API
 
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