diff --git a/CppCoreGuidelines.md b/CppCoreGuidelines.md
index 29e9435..25e8a3d 100644
--- a/CppCoreGuidelines.md
+++ b/CppCoreGuidelines.md
@@ -17184,7 +17184,7 @@ Complementary constraints are unfortunately common in `enable_if` code:
 ##### Note
 
 Complementary requirements on one requirements is sometimes (wrongly) considered manageable.
-However, for two or more requirements the number of definitions needs can go up exponentially (2,4,9,16,...):
+However, for two or more requirements the number of definitions needs can go up exponentially (2,4,8,16,...):
 
     C1<T> && C2<T>
     !C1<T> && C2<T>