diff --git a/src/tea3/f31f32.py b/src/tea3/f31f32.py
index b83e280..c084cb8 100644
--- a/src/tea3/f31f32.py
+++ b/src/tea3/f31f32.py
@@ -67,9 +67,9 @@ def study_algebraic_immunity(vecfun, name="F"):
     ais = []
 
     for i, bf in enumerate(bfs):
-        ai = bf.algebraic_immunity()
-        ais.append(ai)
-        print(f"coordinate {i}: AI = {ai}")
+        ai = bf.algebraic_immunity(annihilator=True)
+        ais.append(ai[0])
+        print(f"coordinate {i}: AI = {ai[0]}, annihilator = {ai[1]}")
 
     print(f"\nminimum AI : {min(ais)}")
     print(f"maximum AI : {max(ais)}")