diff --git a/src/cihai/_internal/config_reader.py b/src/cihai/_internal/config_reader.py
index bcc6db03..94b1e371 100644
--- a/src/cihai/_internal/config_reader.py
+++ b/src/cihai/_internal/config_reader.py
@@ -12,6 +12,16 @@
 FormatLiteral = t.Literal["json", "yaml"]
 
 
+class ConfigFormatNotImplementedError(NotImplementedError):
+    def __init__(self, format: str):
+        return super().__init__(f"{format} not supported in configuration")
+
+
+class ConfigExtensionNotImplementedError(NotImplementedError):
+    def __init__(self, ext: str, path: str | pathlib.Path):
+        return super().__init__(f"{ext} not supported in {path}")
+
+
 class ConfigReader:
     r"""Parse string data (YAML and JSON) into a dictionary.
 
@@ -46,7 +56,7 @@ def _load(format: "FormatLiteral", content: str) -> dict[str, t.Any]:
         elif format == "json":
             return t.cast(dict[str, t.Any], json.loads(content))
         else:
-            raise NotImplementedError(f"{format} not supported in configuration")
+            raise NotImplementedError(format=format)
 
     @classmethod
     def load(cls, format: "FormatLiteral", content: str) -> "ConfigReader":
@@ -109,7 +119,7 @@ def _from_file(cls, path: pathlib.Path) -> dict[str, t.Any]:
         elif path.suffix == ".json":
             format = "json"
         else:
-            raise NotImplementedError(f"{path.suffix} not supported in {path}")
+            raise ConfigExtensionNotImplementedError(ext=path.suffix, path=path)
 
         return cls._load(
             format=format,
@@ -184,7 +194,7 @@ def _dump(
                 indent=2,
             )
         else:
-            raise NotImplementedError(f"{format} not supported in config")
+            raise ConfigFormatNotImplementedError(format=format)
 
     def dump(self, format: "FormatLiteral", indent: int = 2, **kwargs: t.Any) -> str:
         r"""Dump via ConfigReader instance.
diff --git a/src/cihai/core.py b/src/cihai/core.py
index 38b60231..06c4e3aa 100644
--- a/src/cihai/core.py
+++ b/src/cihai/core.py
@@ -25,6 +25,11 @@
 log = logging.getLogger(__name__)
 
 
+class CihaiConfigError(exc.CihaiException):
+    def __init__(self):
+        return super().__init__("Invalid exception with configuration")
+
+
 def is_valid_config(config: "UntypedDict") -> "TypeGuard[ConfigDict]":
     return True
 
@@ -101,7 +106,7 @@ def __init__(
         expand_config(_config, app_dirs)
 
         if not is_valid_config(config=_config):
-            raise exc.CihaiException("Invalid exception with configuration")
+            raise CihaiConfigError()
 
         self.config = _config