diff --git a/TODO b/TODO
index a267baf0..f9e8486d 100644
--- a/TODO
+++ b/TODO
@@ -5,6 +5,9 @@
    other relevant changes.  Should read through ChangeLog and the
    manual before releasing 2.1.
 
+ * Write documentation section on source-level API changes between 2.0
+   and 2.1.
+
  * Update release documentation to remember not to include debugging
    in the Windows release and to strip the DLL and executables.
    Consider making the "install" target do something useful for