diff --git a/src/epub_postprocessor.py b/src/epub_postprocessor.py
index 78a1b83..e550032 100644
--- a/src/epub_postprocessor.py
+++ b/src/epub_postprocessor.py
@@ -61,6 +61,7 @@ class EpubPostprocessor:
             self.build_adjacency_list_from_spine()
         not_added = [x for x in self.href2soup_html if x not in self.added_to_toc_hrefs]
         self.logger.log(f'Html documents not added to TOC: {not_added}.')
+        self.add_not_added_files_to_adjacency_list(not_added)
         # read anchored blocks, split html into separate block
         self.unwrap_all_html_soup()  # used only after parsed toc, ids from toc needed
         self.process_internal_links()
@@ -183,6 +184,11 @@ class EpubPostprocessor:
             self.adjacency_list[-1].append(node)
             self.added_to_toc_hrefs.add(node.href)
 
+    def add_not_added_files_to_adjacency_list(self, not_added):
+        for i, file in enumerate(not_added):
+            node = NavPoint(Section(f'To check #{i}, filename: {file}', file))
+            self.adjacency_list[-1].append(node)
+
     def unwrap_all_html_soup(self):
         # mark
         for href in self.href2soup_html: