diff --git a/Lib/os.py b/Lib/os.py
--- a/Lib/os.py
+++ b/Lib/os.py
@@ -1,17 +1,17 @@
 r"""OS routines for NT or Posix depending on what system we're on.
 
 This exports:
   - all functions from posix or nt, e.g. unlink, stat, etc.
   - os.path is either posixpath or ntpath
   - os.name is either 'posix' or 'nt'
-  - os.curdir is a string representing the current directory ('.' or ':')
-  - os.pardir is a string representing the parent directory ('..' or '::')
-  - os.sep is the (or a most common) pathname separator ('/' or ':' or '\\')
+  - os.curdir is a string representing the current directory (always '.')
+  - os.pardir is a string representing the parent directory (always '..')
+  - os.sep is the (or a most common) pathname separator ('/' or '\\')
   - os.extsep is the extension separator (always '.')
   - os.altsep is the alternate pathname separator (None or '/')
   - os.pathsep is the component separator used in $PATH etc
   - os.linesep is the line separator in text files ('\r' or '\n' or '\r\n')
   - os.defpath is the default search path for executables
   - os.devnull is the file path of the null device ('/dev/null', etc.)
 
 Programs that import and use 'os' stand a better chance of being