diff --git a/pyproject.toml b/pyproject.toml
index 45374fd..ef6d76c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -46,7 +46,7 @@ addopts = [
     "--doctest-glob=README.md",
     "--ignore-glob=scripts"
 ]
-doctest_optionflags = "IGNORE_EXCEPTION_DETAIL"
+doctest_optionflags = "ELLIPSIS"
 
 [tool.black]
 line-length = 120
diff --git a/src/varformat/__init__.py b/src/varformat/__init__.py
index 5085476..e07d2fb 100644
--- a/src/varformat/__init__.py
+++ b/src/varformat/__init__.py
@@ -123,7 +123,7 @@ def format(self, fmtstring: str, /, **kwargs) -> str:
         >>> format("Where is ${Kevin}?")
         Traceback (most recent call last):
             ...
-        KeyError: Kevin
+        KeyError: 'Kevin'
 
         ```
         """
@@ -157,6 +157,7 @@ def vformat(
         Traceback (most recent call last):
             ...
         ValueError: unused arguments: extra
+
         ```
         """
         references = self._references(fmtstring)
@@ -211,8 +212,8 @@ def parse(self, fmtstring: str, /, string: str, *, ambiguity_check=True) -> Unio
         >>> parse("Model-${X}-${Y}", "Model-X1-155-91")
         Traceback (most recent call last):
             ...
-        AmbiguityError: parsing is ambiguous:
-        could be: {'X': 'X1-155', 'Y': '91'}
+        varformat.AmbiguityError: parsing is ambiguous:
+          could be: {'X': 'X1-155', 'Y': '91'}
                 or: {'X': 'X1', 'Y': '155-91'}
         >>> parse("Model-${X}-${Y}", "Model-X1-155-91", ambiguity_check=False)
         {'X': 'X1-155', 'Y': '91'}