diff --git a/README.md b/README.md
index 919f9e4eb3fdd355100b23a05152b88e4d054e9b..7861d5bc66c463aa591bc91b99dc3a11fb0f4d55 100644
--- a/README.md
+++ b/README.md
@@ -184,7 +184,7 @@ We provide a training script using the launch utility provided by PyTorch.
 Supported arguments are:
 
 - --validate: perform evaluation every k (default=1) epochs during the training.
-- --work_dir <WORK_DIR>: if specified, the path in config file will be overwritten.
+- --work_dir <WORK_DIR>: if specified, the path in config file will be replaced.
 
 Expected results in WORK_DIR:
 
diff --git a/mmdet/models/registry.py b/mmdet/models/registry.py
index 7e45ad450dd777e01c9ee3ea0e0aa3f036d40065..bab395d60597f264e86284da275a382074921861 100644
--- a/mmdet/models/registry.py
+++ b/mmdet/models/registry.py
@@ -24,7 +24,7 @@ class Registry(object):
         if not issubclass(module_class, nn.Module):
             raise TypeError(
                 'module must be a child of nn.Module, but got {}'.format(
-                    type(module_class)))
+                    module_class))
         module_name = module_class.__name__
         if module_name in self._module_dict:
             raise KeyError('{} is already registered in {}'.format(