diff --git a/validation/custom_constraint.rst b/validation/custom_constraint.rst
index cd5197c860e..ffe2a3560f5 100644
--- a/validation/custom_constraint.rst
+++ b/validation/custom_constraint.rst
@@ -266,7 +266,7 @@ You can use custom validators like the ones provided by Symfony itself:
             }
         }
 
-If your constraint contains options, then they should be public properties
+If your constraint contains options, then they must be public properties
 on the custom Constraint class you created earlier. These options can be
 configured like options on core Symfony constraints.