Add entry for mixed edge types

diff --git a/doc/todo.html b/doc/todo.html
index 2c18f1cb8355061546859700f3d956f19688ebe6..587c628b62dee60b6fdd9ac3b201e8a764b442c8 100755 (executable)
--- a/doc/todo.html
+++ b/doc/todo.html
@@ -58,6 +58,7 @@ exposed port sides. Perhaps extend compass points to S, N, E, W to
 mean anywhere along that side.
 ? - Tabular layout in rows and columns in dot (swim lanes)
 ? - Enable arbitrary depth clusters in neato using IPSEP
+? - Allow mixed edge types within the same graph
 
 </pre>
 <hr align=left width=66>