diff --git a/src/core/raise_error.py b/src/core/raise_error.py
index a3f6959..3baa4ae 100644
--- a/src/core/raise_error.py
+++ b/src/core/raise_error.py
@@ -59,7 +59,7 @@ def OptionNameHasBadType(
         assert nameType is not None
         assert type(nameType) is type
 
-        errMsg = "Option name has a nad type [{}]".format(
+        errMsg = "Option name has a bad type [{}].".format(
             nameType.__name__,
         )
 
diff --git a/tests/ErrorMessageBuilder.py b/tests/ErrorMessageBuilder.py
index 11d1756..9c5a4d4 100644
--- a/tests/ErrorMessageBuilder.py
+++ b/tests/ErrorMessageBuilder.py
@@ -46,7 +46,7 @@ def OptionNameHasBadType(nameType: type):
         assert nameType is not None
         assert type(nameType) is type
 
-        errMsg = "Option name has nad type [{}]".format(
+        errMsg = "Option name has bad type [{}].".format(
             nameType.__name__,
         )
         return errMsg