diff --git a/B-mass-model.md b/B-mass-model.md
index fd8b0c5..7e33ebf 100644
--- a/B-mass-model.md
+++ b/B-mass-model.md
@@ -61,6 +61,7 @@ The signal can fully turned off or be described by
 
 * Left-sided Crystal Ball
 * Right-sided Crystal Ball
+* Two Crystal Balls
 * Both-sided Crystal Ball
 * Gaussian
 * Double Gaussian