diff -r a84eae63b4cd Doc/library/sqlite3.rst
--- a/Doc/library/sqlite3.rst	Tue Mar 24 10:27:50 2015 +0100
+++ b/Doc/library/sqlite3.rst	Tue Mar 24 10:44:12 2015 +0100
@@ -324,8 +324,8 @@
 
       Creates a user-defined function that you can later use from within SQL
       statements under the function name *name*. *num_params* is the number of
-      parameters the function accepts, and *func* is a Python callable that is called
-      as the SQL function.
+      parameters the function accepts (-1 for any number of arguments), and
+      *func* is a Python callable that is called as the SQL function.
 
       The function can return any of the types supported by SQLite: bytes, str, int,
       float and None.
@@ -340,8 +340,8 @@
       Creates a user-defined aggregate function.
 
       The aggregate class must implement a ``step`` method, which accepts the number
-      of parameters *num_params*, and a ``finalize`` method which will return the
-      final result of the aggregate.
+      of parameters *num_params* (-1 for any number of arguments), and a
+      ``finalize`` method which will return the final result of the aggregate.
 
       The ``finalize`` method can return any of the types supported by SQLite:
       bytes, str, int, float and None.