diff --git a/src/index.ts b/src/index.ts
index 181189b..0561507 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -19,9 +19,9 @@ export function isPluginEnabled(app: App): boolean {
  * @param app 
  * @param component A component that manages the lifecycle of the suggester's quick preview feature. Typically this is your plugin instance. Unload this component to disable quick preview for the suggester.
  * @param suggestClass A suggester class to be patched. `PopoverSuggest` (e.g. `EditorSuggest` & `AbstractInputSuggest`) or `SuggestModal` are supported.
- * @param itemNormalizer A function that converts an item of the suggester to a `SuggestItem` object.
+ * @param itemNormalizer A function that specifies how the preview for an suggestion item should be triggered. Return null when you don't want to show a quick preview for the item.
  */
-export function registerQuickPreview<T>(app: App, component: Component, suggestClass: new (...args: any[]) => PopoverSuggest<T> | SuggestModal<T>, itemNormalizer: (item: T) => PreviewInfo): void {
+export function registerQuickPreview<T>(app: App, component: Component, suggestClass: new (...args: any[]) => PopoverSuggest<T> | SuggestModal<T>, itemNormalizer: (item: T) => PreviewInfo | null): void {
     app.workspace.onLayoutReady(() => {
         const plugin = app.plugins.getPlugin("quick-preview") as QuickPreviewPlugin | undefined;
         if (!plugin) throw Error("Quick Preview API: Quick Preview is not enabled.");
diff --git a/src/main.ts b/src/main.ts
index c967630..ad1f35a 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -88,7 +88,7 @@ export default class QuickPreviewPlugin extends Plugin {
 		}));
 	}
 
-	patchSuggester<T>(suggestClass: new (...args: any[]) => Suggester<T>, itemNormalizer: (item: T) => PreviewInfo) {
+	patchSuggester<T>(suggestClass: new (...args: any[]) => Suggester<T>, itemNormalizer: (item: T) => PreviewInfo | null) {
 		const prototype = suggestClass.prototype;
 		const plugin = this;
 
diff --git a/src/popoverManager.ts b/src/popoverManager.ts
index ada5ed8..53034ca 100644
--- a/src/popoverManager.ts
+++ b/src/popoverManager.ts
@@ -16,7 +16,7 @@ export class PopoverManager<T> extends Component {
     popoverHeight: number | null = null;
     popoverWidth: number | null = null;
 
-    constructor(private plugin: QuickPreviewPlugin, public suggest: PatchedSuggester<T>, private itemNormalizer: (item: T) => PreviewInfo) {
+    constructor(private plugin: QuickPreviewPlugin, public suggest: PatchedSuggester<T>, private itemNormalizer: (item: T) => PreviewInfo | null) {
         super();
 
         if (suggest instanceof PopoverSuggest) this.suggestions = suggest.suggestions;
@@ -74,8 +74,8 @@ export class PopoverManager<T> extends Component {
 
         this.currentHoverParent = new QuickPreviewHoverParent(this.suggest);
 
-        const info: PreviewInfo = this.itemNormalizer(item);
-        this.plugin.onLinkHover(this.currentHoverParent, null, info.linktext, info.sourcePath, { scroll: info.line });
+        const info = this.itemNormalizer(item);
+        if (info) this.plugin.onLinkHover(this.currentHoverParent, null, info.linktext, info.sourcePath, { scroll: info.line });
     };
 
     getShownPos(): { x: number, y: number } {