diff --git a/packages/core/src/SoundTouch.spec.ts b/packages/core/src/SoundTouch.spec.ts
index f86068e..cf58a4e 100644
--- a/packages/core/src/SoundTouch.spec.ts
+++ b/packages/core/src/SoundTouch.spec.ts
@@ -227,6 +227,10 @@ describe('SoundTouch', () => {
   });
 
   describe('runtime interpolation strategy controls', () => {
+    it('defaults to the only strategy registered out of the box', () => {
+      expect(new SoundTouch().interpolationStrategy).toBe('lanczos');
+    });
+
     it('switches interpolation strategy through SoundTouch API', () => {
       const st = new SoundTouch({ interpolationStrategy: 'lanczos' });
 
diff --git a/packages/core/src/SoundTouch.ts b/packages/core/src/SoundTouch.ts
index 92a1c57..e85d560 100644
--- a/packages/core/src/SoundTouch.ts
+++ b/packages/core/src/SoundTouch.ts
@@ -67,7 +67,12 @@ export interface SoundTouchOptions {
   /**
    * Interpolation strategy used by the rate transposer stage.
    *
-   * @defaultValue 'linear'
+   * @remarks
+   * Only `lanczos` is registered out of the box. Every other id — including
+   * `linear` — comes from an `@soundtouchjs/interpolation-strategy-*` package
+   * and must be registered before it can be named here, or construction throws.
+   *
+   * @defaultValue 'lanczos'
    */
   interpolationStrategy?: RateTransposerInterpolationStrategy;