diff --git a/todo.txt b/todo.txt
index a29636d..2c0e307 100644
--- a/todo.txt
+++ b/todo.txt
@@ -1,5 +1,12 @@
 features:
 
+- Add optional functions (macro defs.) that get called during various rendering
+  steps, to e.g. be able to analyze and visualize rendering step by step.
+  
+- Benchmarking in test.c.
+
+- Test on big endien.
+
 - Optional OpenGL acceleration, perhaps a separate header file with the same
   API. How this can work: