diff --git a/clintest/assertion.py b/clintest/assertion.py
index 2aa6b12..209f715 100644
--- a/clintest/assertion.py
+++ b/clintest/assertion.py
@@ -198,7 +198,7 @@ def holds_for(self, model: Model) -> bool:
 class Or(Assertion):
     """
     The disjunction of a list of given assertions.
-    This assertions hold if any `args` hold.
+    This assertion holds if any `args` hold.
 
     Parameters
     ----------