diff --git a/htdocs/TMW_RTF_TO_THDL_WYLIE.html b/htdocs/TMW_RTF_TO_THDL_WYLIE.html
index f048b26..b452d20 100644
--- a/htdocs/TMW_RTF_TO_THDL_WYLIE.html
+++ b/htdocs/TMW_RTF_TO_THDL_WYLIE.html
@@ -345,8 +345,10 @@ Non-TMW character newline [decimal 10] in the font Times New Roman appears first
 <p>
   The other conversions are all-or-nothing.&nbsp; That is, if you run
   into any trouble whatsoever, the result will be a file containing
-  just the problematic glyphs.&nbsp; If your result is as long as your
-  input, then the conversion went flawlessly.
+  just the problematic glyphs, each preceded by achen (i.e., U+0F68,
+  the letter whose THDL Extended Wylie representation is 'a').&nbsp;
+  If your result is as long as your input, then the conversion went
+  flawlessly.
 </p>
 
 <p>