fix loss of a space after indexing markup
diff --git a/Doc/lib/libhtmllib.tex b/Doc/lib/libhtmllib.tex
index 59065f4..1cddd0a 100644
--- a/Doc/lib/libhtmllib.tex
+++ b/Doc/lib/libhtmllib.tex
@@ -20,7 +20,7 @@
\refmodule{sgmllib}\refstmodindex{sgmllib}. The \class{HTMLParser}
implementation supports the HTML 2.0 language as described in
\rfc{1866}. Two implementations of formatter objects are provided in
-the \refmodule{formatter}\refstmodindex{formatter} module; refer to the
+the \refmodule{formatter}\refstmodindex{formatter}\ module; refer to the
documentation for that module for information on the formatter
interface.
\withsubitem{(in module sgmllib)}{\ttindex{SGMLParser}}