diff --git a/docs/concepts.md b/docs/concepts.md
index bd489b1..1d1bbdd 100644
--- a/docs/concepts.md
+++ b/docs/concepts.md
@@ -30,6 +30,12 @@ Assets expose properties that can be referenced in operations. The properties cu
 * `duration`: duration of the audio/video in seconds (audio and video assets only)
 * `width`: width of the video in pixels (video and image assets only)
 * `height`: width of the video in pixels (video and image assets only)
+* `aspectRatio`: ratio of width / height (video and image assets only)
+* `samplingRate`: sampling rate in Hz (audio assets only)
+* `tracks`: array of tracks. only includes audio and video tracks (video only)
+* `audioTracks`: array of audio tracks (video only)
+* `videoTracks`: array of video tracks (video only)
+* `assets`: for a list asset, these are the nested sub-assets
 
 ## Operations
 Operations represent transformations to perform on the inputs, and validations
diff --git a/docs/jvc_js.md b/docs/jvc_js.md
index b216bb9..43b97e7 100644
--- a/docs/jvc_js.md
+++ b/docs/jvc_js.md
@@ -61,6 +61,12 @@ Resolution width in pixes (video or image).
 #### `height`
 Resolution height in pixes (video or image).
 
+#### `aspectRatio`
+Ratio of width / height (video or image).
+
+#### `samplingRate`
+Sampling rate in Hz (audio).
+
 #### `tracks`
 An array of the tracks in a video. Only includes audio and video tracks.
 
diff --git a/src/main/java/jvc/model/js/JAssetJs.java b/src/main/java/jvc/model/js/JAssetJs.java
index 281dd97..4a1951e 100644
--- a/src/main/java/jvc/model/js/JAssetJs.java
+++ b/src/main/java/jvc/model/js/JAssetJs.java
@@ -16,6 +16,8 @@ public class JAssetJs {
     public Double duration;
     public Integer width;
     public Integer height;
+    public Double aspectRatio;
+    public Integer samplingRate;
     public JTrackJs[] tracks = EMPTY_TRACKS;
     public JTrackJs[] videoTracks = EMPTY_TRACKS;
     public JTrackJs[] audioTracks = EMPTY_TRACKS;
@@ -31,6 +33,9 @@ public class JAssetJs {
         final BigDecimal h = asset.height();
         this.height = h == null ? null : h.intValue();
 
+        this.aspectRatio = asset.aspectRatio() == null ? Double.NaN : asset.aspectRatio().doubleValue();
+        this.samplingRate = asset.hasSamplingRate() ? asset.samplingRate().intValue() : 0;
+
         if (asset.hasInfo()) {
             final JMediaInfo info = asset.getInfo();
             for (JTrack track : info.getMedia().getTrack()) {