diff --git a/pdflib_demo b/pdflib_demo
index b9257d7..ca01aac 100755
--- a/pdflib_demo
+++ b/pdflib_demo
@@ -14,6 +14,8 @@
  Links:
   - https://www.pdflib.com/developer/technical-documentation/manuals/
   - https://www.pdflib.com/pdflib-cookbook/browse-all-topics/
+  - https://www.pdflib.com/pdflib-cookbook/graphics/layers-and-bookmarks/php-layers-and-bookmarks/
+  - https://www.pdflib.com/pdflib-cookbook/text-output/create-interactive-index/php-create-interactive-index/
   - https://www.pdflib.com/pdflib-cookbook/general-programming/starter-basic/php-general-progamming-issues/
   - https://www.pdflib.com/en/pdflib-cookbook/block-handling-and-pps/linked-textblocks/php-linked-textblocks/
   - https://www.pdflib.com/pdflib-cookbook/interactive-elements/link-annotations/php-link-annotations/