diff --git a/kioss/_pipe.py b/kioss/_pipe.py
index f6fd95f..1f345e6 100644
--- a/kioss/_pipe.py
+++ b/kioss/_pipe.py
@@ -367,7 +367,7 @@ def _accept(self, visitor: "AVisitor") -> Any:
         return visitor.visit_catch_pipe(self)
 
     def __str__(self) -> str:
-        return f"Catch(exception instances of classes [{', '.join(map(lambda class_: class_.__name__, self.classes))}]{', with an additional `when` condition' if self.when is not None else ''})"
+        return f"Catch(exception instances of class in [{', '.join(map(lambda class_: class_.__name__, self.classes))}]{', with an additional `when` condition' if self.when is not None else ''})"
 
 
 class ChainPipe(APipe[T]):