diff --git a/Doc/lib/libsocksvr.tex b/Doc/lib/libsocksvr.tex
index 98ffec6..c4b0e73 100644
--- a/Doc/lib/libsocksvr.tex
+++ b/Doc/lib/libsocksvr.tex
@@ -37,7 +37,7 @@
 Server classes have the same external methods and attributes, no
 matter what network protocol they use:
 
-\renewcommand{\indexsubitem}{(SocketServer protocol)}
+\setindexsubitem{(SocketServer protocol)}
 
 %XXX should data and methods be intermingled, or separate?
 % how should the distinction between class and instance variables be