Update signature style for optional arguments, part 3.
diff --git a/Doc/library/curses.rst b/Doc/library/curses.rst
index 21c3176..b16d667 100644
--- a/Doc/library/curses.rst
+++ b/Doc/library/curses.rst
@@ -531,7 +531,7 @@
capability, or is canceled or absent from the terminal description.
-.. function:: tparm(str[,...])
+.. function:: tparm(str[, ...])
Instantiates the string *str* with the supplied parameters, where *str* should
be a parameterized string obtained from the terminfo database. E.g.