--- loncom/html/adm/help/tex/Authoring_Output_Tags.tex	2008/09/10 21:00:59	1.9
+++ loncom/html/adm/help/tex/Authoring_Output_Tags.tex	2009/10/15 03:40:45	1.10
@@ -11,7 +11,7 @@ This group of tags generates useful outp
 Expressions are displayed using the math expression display mechanism defined in the user's preferences.  The default is tth.  See the section below concerning the $<$m$>$ tag for more information on that as well as on the attribute \textbf{display}.
 \item \textbf{chem}\index{chem}: Typesets chemical equation 
 \begin{verbatim}
-  <chem>02 + 2H2 -> 2H20</chem>
+  <chem>O2 + 2H2 -> 2H2O</chem>
 \end{verbatim}
 \item \textbf{num}\index{num}: Typesets a number formatted in scientific notation, fixed point, fixed point with commas, fixed point with commas and dollar sign, or in significant digits. 
 \begin{verbatim}