diff --git a/CppCoreGuidelines.md b/CppCoreGuidelines.md
index 0a4a6c4..d7ab49f 100644
--- a/CppCoreGuidelines.md
+++ b/CppCoreGuidelines.md
@@ -3883,7 +3883,7 @@ A destructor (either user-defined or compiler-generated) is implicitly declared
 
 ## <a name="SS-ctor"></a> C.ctor: Constructors
 
-A constructor defined how an object is initialized (constructed).
+A constructor defines how an object is initialized (constructed).
 
 ### <a name="Rc-ctor"></a> C.40: Define a constructor if a class has an invariant