diff --git a/guest_rust/src/lib.rs b/guest_rust/src/lib.rs
index 0ad481c..8830848 100644
--- a/guest_rust/src/lib.rs
+++ b/guest_rust/src/lib.rs
@@ -186,7 +186,7 @@ fn main2() -> Result<()> {
                 denominator: *ratio.denom() as u32,
             });
         println!("setting sampling rate to {:?}", value);
-        sensor.set_property(wasi::sensor::property::PropertyKey::SamplingRate, &value)?;
+        sensor.set_property(wasi::sensor::property::PropertyKey::SamplingRate, value)?;
         // confirm the result
         let value = sensor.get_property(wasi::sensor::property::PropertyKey::SamplingRate)?;
         println!("sensor sampling rate {:?}", value);
diff --git a/sensing.md b/sensing.md
index a27be68..7bb987f 100644
--- a/sensing.md
+++ b/sensing.md
@@ -112,12 +112,6 @@
 <li><a name="fraction.numerator"><code>numerator</code></a>: <code>u32</code></li>
 <li><a name="fraction.denominator"><code>denominator</code></a>: <code>u32</code></li>
 </ul>
-<h4><a name="exposure"><code>record exposure</code></a></h4>
-<h5>Record Fields</h5>
-<ul>
-<li><a name="exposure.mode"><code>mode</code></a>: <code>string</code><p>Mode of exposure.
-</li>
-</ul>
 <h4><a name="property_key"><code>enum property-key</code></a></h4>
 <h5>Enum Cases</h5>
 <ul>
@@ -129,16 +123,12 @@ Eg. frame rate for image sensors.
 <li>
 <p><a name="property_key.dimension"><a href="#dimension"><code>dimension</code></a></a></p>
 </li>
-<li>
-<p><a name="property_key.exposure"><a href="#exposure"><code>exposure</code></a></a></p>
-</li>
 </ul>
 <h4><a name="property_value"><code>variant property-value</code></a></h4>
 <h5>Variant Cases</h5>
 <ul>
 <li><a name="property_value.fraction"><a href="#fraction"><code>fraction</code></a></a>: <a href="#fraction"><a href="#fraction"><code>fraction</code></a></a></li>
 <li><a name="property_value.dimension"><a href="#dimension"><code>dimension</code></a></a>: <a href="#dimension"><a href="#dimension"><code>dimension</code></a></a></li>
-<li><a name="property_value.exposure"><a href="#exposure"><code>exposure</code></a></a>: <a href="#exposure"><a href="#exposure"><code>exposure</code></a></a></li>
 </ul>
 <h2><a name="wasi:sensor_sensor">Import interface wasi:sensor/sensor</a></h2>
 <hr />
diff --git a/wit/property.wit b/wit/property.wit
index 39bec04..15d30f7 100644
--- a/wit/property.wit
+++ b/wit/property.wit
@@ -7,29 +7,16 @@ interface property {
     denominator: u32
   }
 
-
-
-  record exposure {
-    /// Mode of exposure.
-    mode: string,
-    /// More parameters for exposure.
-  }
-
-
   enum property-key {
     /// The number of samples in a second. (fraction)
     /// Eg. frame rate for image sensors.
     sampling-rate,
-
     dimension,
-    exposure,
   }
 
   variant property-value {
     fraction(fraction),
-
     dimension(dimension),
-    exposure(exposure),
   }
 }