--- a/docs/obs-concept.rst	Wed Sep 19 15:28:35 2012 +0200
+++ b/docs/obs-concept.rst	Tue Sep 25 12:06:48 2012 +0200
@@ -57,15 +57,8 @@
 *meaningful*.
 
 
-.. warning:: add a schema::
+.. figure:: ./figures/git.*
 
-        C
-        | B---<foo>
-        |/
-        |
-        A
-
-    Only B and A are visible.
 
 This simplifies the process of getting rid of old changesets. You can
 just leave them in place and move the reference on the new one. You
@@ -300,8 +293,7 @@
 will keep the same parent than `A'` and `A''` with two obsolete
 markers pointing to both `A` and `A'`
 
-.. warning::  TODO: Add a schema of the resolution. (merge A' and A'' with A as
-              ancestor and graft the result of A^)
+.. figure:: ./figures/explain-troubles-concurrent-10-solution.*
 
 Allowing multiple new changesets to obsolete a single one allows to
 distinguish a split changeset from a history rewriting conflict.
@@ -325,12 +317,14 @@
 * *newer* version of a public changeset are called **latecomer** and
   highlighted as an error case.
 
+.. figure:: ./figures/explain-troubles-concurrent-10-sumup.*
+
 Solving such an error is easy. Because we know what changeset a
 *latecomer* tries to rewrite, we can easily compute a smaller
 changeset containing only the change from the old *public* to the new
 *latecomer*.
 
-.. warning:: add a schema
+.. figure:: ./figures/explain-troubles-concurrent-15-solution.*
 
 
 Conclusion