diff --git a/Document-Processing/PDF/PDF-Viewer/flutter/page-navigation.md b/Document-Processing/PDF/PDF-Viewer/flutter/page-navigation.md
index 5a0759eda7..f62b1e3801 100644
--- a/Document-Processing/PDF/PDF-Viewer/flutter/page-navigation.md
+++ b/Document-Processing/PDF/PDF-Viewer/flutter/page-navigation.md
@@ -234,4 +234,6 @@ Widget build(BuildContext context) {
 }
 
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+N> Avoid calling `setState()` inside the `onPageChanged` or `onDocumentLoaded` callbacks. Doing so rebuilds the entire widget tree — including the `SfPdfViewer` — which can decrease performance when viewing large PDF documents. Instead, use an `addListener()` to the `PdfViewerController` to monitor page changes and update only the specific UI elements that need to change (for example, the page number indicator). This keeps viewer rebuilds to a minimum and delivers smoother scrolling and better stability with large PDF files.
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