Fix docstring typo
diff --git a/Lib/platform.py b/Lib/platform.py
index 8e3b47f..613967a 100755
--- a/Lib/platform.py
+++ b/Lib/platform.py
@@ -449,7 +449,7 @@
         means the OS version uses debugging code, i.e. code that
         checks arguments, ranges, etc. (Thomas Heller).
 
-        Note: this functions only works if Mark Hammond's win32
+        Note: this function only works if Mark Hammond's win32
         package is installed and obviously only runs on Win32
         compatible platforms.