diff --git a/Contents.md b/Contents.md
index 9a50777..d74321c 100644
--- a/Contents.md
+++ b/Contents.md
@@ -24,6 +24,7 @@ This is a VERY provisional list of contents to start the discussion.
 * Dual stacks
 * Tunnels
 * Translation
+* Obsolete techniques
 4. Security
 * Layer 2 considerations
 * Filtering