diff --git a/README.md b/README.md
index 425045e..4d69625 100644
--- a/README.md
+++ b/README.md
@@ -50,10 +50,12 @@ Choose the `op` property from one of the following values:
 
 * For metrics of type __Counter__:
   * `inc` - Increases the counter by `val` (without specifying `val`, defaults to `1`)
+  * `remove` - Remove the stored value
 * For metrics of type __Gauge__:
   * `set` - Sets the gauge to `val` (which is mandatory for this operation)
   * `inc` - Increases the gauge by `val` (without specifying `val`, defaults to `1`)
   * `dec` - Decreases the gauge by `val` (without specifying `val`, defaults to `1`)
+  * `remove` - Remove the stored value
 
 As described above, the `val` property is mandatory or optional depending on the selected `op` and the metric type.
 
diff --git a/prometheus-exporter/prometheus-exporter.html b/prometheus-exporter/prometheus-exporter.html
index b3401ab..3155c3b 100644
--- a/prometheus-exporter/prometheus-exporter.html
+++ b/prometheus-exporter/prometheus-exporter.html
@@ -37,6 +37,7 @@ <h2>Using the metric in a flow</h2>
         <ul>
           <li><code>inc</code> - Increases the counter by <code>val</code> (without specifying <code>val</code>,
             defaults to <code>1</code>)</li>
+          <li><code>remove</code> - Remove the stored value</li>
         </ul>
       </li>
       <li>For metrics of type <strong>Gauge</strong>:
@@ -46,6 +47,7 @@ <h2>Using the metric in a flow</h2>
             to <code>1</code>)</li>
           <li><code>dec</code> - Decreases the gauge by <code>val</code> (without specifying <code>val</code>, defaults
             to <code>1</code>)</li>
+          <li><code>remove</code> - Remove the stored value</li>
         </ul>
       </li>
     </ul>
@@ -101,4 +103,4 @@ <h2>Check the metrics output</h2>
     label: label,
     paletteLabel: 'prometheus out'
   });
-</script>
\ No newline at end of file
+</script>
diff --git a/prometheus-exporter/prometheus-exporter.js b/prometheus-exporter/prometheus-exporter.js
index 1470a08..8d323c3 100644
--- a/prometheus-exporter/prometheus-exporter.js
+++ b/prometheus-exporter/prometheus-exporter.js
@@ -1,6 +1,6 @@
 const VALID_OPS = {
-  counter: ['inc'],
-  gauge: ['inc', 'dec', 'set']
+  counter: ['inc', 'remove'],
+  gauge: ['inc', 'dec', 'set', 'remove']
 };
 
 const DEFAULT_OPS = {
@@ -37,8 +37,8 @@ module.exports = function (RED) {
           }
           // apply specific value
           if (msg.payload.val === undefined || msg.payload.val === null) {
-            // no value is only allowed for counter
-            if (this.metricConfig.mtype !== 'counter') {
+            // no value is only allowed for counter or remove op
+            if (this.metricConfig.mtype !== 'counter' && metricOp !== 'remove') {
               done('Missing val for metric type ' + this.metricConfig.mtype);
             }
           } else {