Fix version added for csv writeheader.
diff --git a/Doc/library/csv.rst b/Doc/library/csv.rst
index 502d934..71523b5 100644
--- a/Doc/library/csv.rst
+++ b/Doc/library/csv.rst
@@ -399,7 +399,7 @@
 
    Write a row with the field names (as specified in the constructor).
 
-   .. versionadded:: 2.7
+   .. versionadded:: 3.2
 
 
 .. _csv-examples: