diff --git a/TODO b/TODO
index 1ff77e64..a2a29061 100644
--- a/TODO
+++ b/TODO
@@ -61,6 +61,10 @@ Future issues:
     - Output error after usage.
 * Fix bus scan hang when calling ecrt_master_deactivate().
 
+Documentation
+
+* Update FSM graphs.
+
 Smaller issues:
 
 * Read out CRC counters.