5 files changed, 6 insertions, 6 deletions
diff --git a/django/utils/archive.py b/django/utils/archive.py
index 0faf1fa781..0a95fa84a6 100644
--- a/django/utils/archive.py
+++ b/django/utils/archive.py
@@ -126,10 +126,10 @@ class BaseArchive(object):
         return True
 
     def extract(self):
-        raise NotImplementedError
+        raise NotImplementedError('subclasses of BaseArchive must provide an extract() method')
 
     def list(self):
-        raise NotImplementedError
+        raise NotImplementedError('subclasses of BaseArchive must provide a list() method')
 
 
 class TarArchive(BaseArchive):
diff --git a/django/utils/dateformat.py b/django/utils/dateformat.py
index 85eb975f84..3c235d9867 100644
--- a/django/utils/dateformat.py
+++ b/django/utils/dateformat.py
@@ -65,7 +65,7 @@ class TimeFormat(Formatter):
 
     def B(self):
         "Swatch Internet time"
-        raise NotImplementedError
+        raise NotImplementedError('may be implemented in a future release')
 
     def e(self):
         """
diff --git a/django/utils/feedgenerator.py b/django/utils/feedgenerator.py
index e632845a84..f7fec5e7f9 100644
--- a/django/utils/feedgenerator.py
+++ b/django/utils/feedgenerator.py
@@ -177,7 +177,7 @@ class SyndicationFeed(object):
         Outputs the feed in the given encoding to outfile, which is a file-like
         object. Subclasses should override this.
         """
-        raise NotImplementedError
+        raise NotImplementedError('subclasses of SyndicationFeed must provide a write() method')
 
     def writeString(self, encoding):
         """
diff --git a/django/utils/functional.py b/django/utils/functional.py
index bfd59e5340..65ec4b53c4 100644
--- a/django/utils/functional.py
+++ b/django/utils/functional.py
@@ -257,7 +257,7 @@ class LazyObject(object):
         """
         Must be implemented by subclasses to initialise the wrapped object.
         """
-        raise NotImplementedError
+        raise NotImplementedError('subclasses of LazyObject must provide a _setup() method')
 
     # Introspection support
     __dir__ = new_method_proxy(dir)
diff --git a/django/utils/regex_helper.py b/django/utils/regex_helper.py
index 7b40d141de..449bb8da42 100644
--- a/django/utils/regex_helper.py
+++ b/django/utils/regex_helper.py
@@ -92,7 +92,7 @@ def normalize(pattern):
                 result.append(".")
             elif ch == '|':
                 # FIXME: One day we'll should do this, but not in 1.0.
-                raise NotImplementedError
+                raise NotImplementedError('Awaiting Implementation')
             elif ch == "^":
                 pass
             elif ch == '$':