#5158: added documentation on the depends option in distutils extensions

Doc/ACKS.txt

@@ -18,6 +18,7 @@ docs@python.org), and we'll be glad to correct the problem.
    * Oliver Andrich
    * Heidi Annexstad
    * Jesús Cea Avión
+   * Manuel Balsera
    * Daniel Barclay
    * Chris Barker
    * Don Bashford

Doc/distutils/setupscript.rst

@@ -347,6 +347,10 @@ symbols (functions or variables) to be exported. This option is not needed when
 building compiled extensions: Distutils  will automatically add ``initmodule``
 to the list of exported symbols.
 
+The :option:`depends` option is a list of files that the extension depends on
+(for example header files). The build command will call the compiler on the
+sources to rebuild extension if any on this files has been modified since the
+previous build.
 
 Relationships between Distributions and Packages
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