diff --git a/mermaid2/plugin.py b/mermaid2/plugin.py
index 580a19a..f72f17c 100755
--- a/mermaid2/plugin.py
+++ b/mermaid2/plugin.py
@@ -96,6 +96,7 @@ def extra_mermaid_lib(self) -> str:
         """
         Provides the mermaid library defined in mkdocs.yml (if any)
         """
+        # as of mkdocs 1.5, extra_javascript is a list of objects; convert to string
         extra_javascript = map(str, self.full_config.get('extra_javascript', []))
         for lib in extra_javascript:
             # get the actual library name