diff --git a/html/rect.html b/html/rect.html
index d23d827..4cd22db 100644
--- a/html/rect.html
+++ b/html/rect.html
@@ -1,4 +1,4 @@
-docname=rectangles:Rectangles
+docname=rect:Rectangles
 <p>
 Draw lines along the grid edges to divide the grid into rectangles,
 so that each rectangle contains exactly one numbered square and its