diff --git a/smoothie/smoothie.d.ts b/smoothie/smoothie.d.ts
index 18f0cc0a56..714590f84e 100644
--- a/smoothie/smoothie.d.ts
+++ b/smoothie/smoothie.d.ts
@@ -1,4 +1,4 @@
-// Type definitions for Smoothie Charts 1.21
+// Type definitions for Smoothie Charts 1.25
 // Project: https://github.com/joewalnes/smoothie
 // Definitions by: Drew Noakes <https://drewnoakes.com>, Mike H. Hawley <https://github.com/mikehhawley>
 // Definitions: https://github.com/borisyankov/DefinitelyTyped/smoothie
@@ -41,6 +41,11 @@ declare module "smoothie"
          */
         constructor(options?: ITimeSeriesOptions);
 
+        /**
+         * Clears all data and state from this TimeSeries object.
+         */
+        clear(): void;
+
         /**
          * Recalculate the min/max values for this <code>TimeSeries</code> object.
          *