diff --git a/src/backend/common/infrastructure/config/source/deezer.ts b/src/backend/common/infrastructure/config/source/deezer.ts
index a8708389..42b3020d 100644
--- a/src/backend/common/infrastructure/config/source/deezer.ts
+++ b/src/backend/common/infrastructure/config/source/deezer.ts
@@ -81,6 +81,14 @@ export type DeezerInternalData = z.infer<typeof deezerInternalDataSchema>;
 
 export const deezerInternalSourceOptionsSchema = z.object({
     ...commonSourceOptionsSchema.shape,
+    /**
+     * Set the heuristic level of duplicate/repeated track pruning from listening history.
+     * 
+     * Some third party integrations (Sonos) cause Deezer to report the same track many times in listening history
+     * 
+     * * `true` => detect plays with play times at exact, close to, or fuzzy (beginning/end of predicated play time + duration)
+     * * `aggressive` => above AND check for plays during previous play times that occurred during the track (50% +/- duration plus playedAt date)
+     */
     fuzzyDiscoveryIgnore: z.union([z.boolean(), z.literal('aggressive')]).optional(),
 });
 
diff --git a/src/backend/sources/DeezerInternalSource.ts b/src/backend/sources/DeezerInternalSource.ts
index 7cb2dc19..3f3ff099 100644
--- a/src/backend/sources/DeezerInternalSource.ts
+++ b/src/backend/sources/DeezerInternalSource.ts
@@ -333,7 +333,7 @@ export default class DeezerInternalSource extends MemorySource {
     protected getBackloggedPlays = async (options: RecentlyPlayedOptions = {}) => await this.getRecentlyPlayed({formatted: true, ...options})
 
 
-    existingDiscovered = async (play: PlayObject, opts: {checkAll?: boolean} = {}): Promise<PlayObject | undefined> => {
+    async existingDiscovered(play: PlayObject): Promise<PlayObject | undefined> {
         const list: PlayObject[] = await this.getRecentlyDiscoveredPlays();
         const candidate = await this.transformPlay(play, TRANSFORM_HOOK.candidate);
         const existing = await findAsync(list, async x => {