diff --git a/src/bonsai/bonsai/bim/module/drawing/svgwriter.py b/src/bonsai/bonsai/bim/module/drawing/svgwriter.py
index 15f9e8c579..b61ef88562 100644
--- a/src/bonsai/bonsai/bim/module/drawing/svgwriter.py
+++ b/src/bonsai/bonsai/bim/module/drawing/svgwriter.py
@@ -776,6 +776,8 @@ class SvgWriter:
         }
 
     def add_fill_bg(self, element: svgwrite.text.Text, copy: bool = True) -> svgwrite.text.Text:
+        # Useful since tspans and texts do not support "background-color"
+        # so we just add a filter. Have to do it in a separate tag to avoid blurry image.
         if copy:
             element = element.copy()
         if hasattr(element, "xml"):