diff --git a/MarathonData.md b/MarathonData.md
index 84a9127..63585ba 100644
--- a/MarathonData.md
+++ b/MarathonData.md
@@ -766,10 +766,11 @@ Ambient Sound is 16 bytes.
 
 | Name           | Type       | Offset |
 | ----           | ----       | ------ |
-| `Flags`        | `u16`      | `0`    |
 | `Index`        | `u16`      | `2`    |
 | `Volume`       | `u16`      | `4`    |
 
+- `Volume` is the volume of this sound, in range 0-256.
+
 ### Static Map Info ###
 
 Static Map Info is 88 bytes.
diff --git a/src/main.rs b/src/main.rs
index 17d5bd9..9b5acee 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -55,6 +55,7 @@ fn dump_chunk(opt: &Options, cid: Ident, cnk: &[u8], eid: u16) -> ResultS<()>
          b"POLY" => make_yaml(opt, &rd_array(cnk, map::read_poly)?)?,
          b"LITE" => make_yaml(opt, &rd_array(cnk, map::read_lite)?)?,
          b"OBJS" => make_yaml(opt, &rd_array(cnk, map::read_objs)?)?,
+         b"ambi" => make_yaml(opt, &rd_array(cnk, map::read_ambi)?)?,
          b"term" => make_yaml(opt, &rd_array(cnk, trm::read_term)?)?,
          _ => (),
       }
diff --git a/src/marathon/map.rs b/src/marathon/map.rs
index c887f06..a6f5d2b 100644
--- a/src/marathon/map.rs
+++ b/src/marathon/map.rs
@@ -218,6 +218,17 @@ pub fn read_objs(b: &[u8]) -> ResultS<(Object, usize)>
    Ok((Object{group, index, angle, poly, pos_x, pos_y, pos_z, flags, bias}, 16))
 }
 
+pub fn read_ambi(b: &[u8]) -> ResultS<(SoundAmbi, usize)>
+{
+   read_data! {
+      16, BE in b =>
+      index  = u16[2];
+      volume = u16[4];
+   }
+
+   Ok((SoundAmbi{index, volume}, 16))
+}
+
 #[derive(Clone, PartialEq, Serialize)]
 pub struct Point
 {
@@ -321,6 +332,13 @@ pub struct Object
    pub bias:  u16,
 }
 
+#[derive(Debug, Serialize)]
+pub struct SoundAmbi
+{
+   pub index:  u16,
+   pub volume: u16,
+}
+
 #[derive(Debug, PartialEq, Serialize)]
 pub struct Minf
 {