diff --git a/README.org b/README.org
index 03d1064..ba04d1e 100644
--- a/README.org
+++ b/README.org
@@ -34,6 +34,19 @@ interaction with Org-mode.
    that I work on the subsequent items decreases with their position
    in the list.
 
+*** TODO Write new functions for building the interaction graphs
+    1. =variables-interact?=
+    2. =get-interaction-sign=
+    3. =build-interaction-graph=
+
+    I currently have two different kinds of function for building
+    interaction graphs: the syntactic interaction graphs and the
+    interaction graphs as typically defined in the papers.  These two
+    kinds of graphs are not exactly the same.  I have already started
+    marking the split by renaming the original
+    =build-interaction-graph= to =build-syntactic-interaction-graph=.
+    The other functions are somewhat badly structured, somewhat badly
+    written, and potentially somewhat wrong.
 *** TODO Review =build-interaction-graph=
     Check that the definition of this function really follows the
     definition of the interaction graph.  Pay attention to the