diff --git a/requirements.txt b/requirements.txt
index 93b5761f..7125e32f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,3 +8,4 @@ Pygments
 git+https://github.com/pugong/mkdocs-mermaid-plugin
 mkdocs-git-authors-plugin
 mkdocs-git-revision-date-plugin
+mkdocs-add-number-plugin