diff --git a/CppCoreGuidelines.md b/CppCoreGuidelines.md
index 84cbbe7..7be62fe 100644
--- a/CppCoreGuidelines.md
+++ b/CppCoreGuidelines.md
@@ -3327,7 +3327,7 @@ When I call `length(s)` should I check if `s` is `nullptr` first? Should the imp
 
 ##### Note
 
-`zstring` do not represent ownership.
+`zstring` does not represent ownership.
 
 **See also**: [Support library](#S-gsl)