Fix typo.
diff --git a/Lib/platform.py b/Lib/platform.py
index ccceeb3..82f9fa7 100755
--- a/Lib/platform.py
+++ b/Lib/platform.py
@@ -360,7 +360,7 @@
 def _norm_version(version,build=''):
 
     """ Normalize the version and build strings and return a single
-        vesion string using the format major.minor.build (or patchlevel).
+        version string using the format major.minor.build (or patchlevel).
     """
     l = string.split(version,'.')
     if build: