update style guide docs to reflect change to (void)
diff --git a/docs/contributing.rst b/docs/contributing.rst
index 620e1b6..139f7f3 100644
--- a/docs/contributing.rst
+++ b/docs/contributing.rst
@@ -110,14 +110,14 @@
         ...;
     };
 
-Don't include stray ``void`` parameters:
+Include ``void`` if the function takes no arguments:
 
 .. code-block:: c
 
     // Good
-    long f();
-    // Bad
     long f(void);
+    // Bad
+    long f();
 
 Wrap lines at 80 characters like so: