diff -r 136adbcefa5f Doc/library/zlib.rst
--- a/Doc/library/zlib.rst	Sun Jan 03 18:00:31 2016 -0800
+++ b/Doc/library/zlib.rst	Sat Jan 30 20:46:15 2016 +0200
@@ -55,7 +55,7 @@
    Raises the :exc:`error` exception if any error occurs.
 
 
-.. function:: compressobj(level=-1, method=DEFLATED, wbits=15, memLevel=8, strategy=Z_DEFAULT_STRATEGY[, zdict])
+.. function:: compressobj(level=6, method=DEFLATED, wbits=15, memLevel=8, strategy=Z_DEFAULT_STRATEGY[, zdict])
 
    Returns a compression object, to be used for compressing data streams that won't
    fit into memory at once.