diff --git a/Doc/tools/mkhowto.sh b/Doc/tools/mkhowto.sh
index 393e419392a..26deac9bff3 100755
--- a/Doc/tools/mkhowto.sh
+++ b/Doc/tools/mkhowto.sh
@@ -38,6 +38,7 @@ Options specifying formats to build:
     --pdf		Portable Document Format (default)
     --ps		PostScript
     --dvi		"DeVice Indepentent" format from TeX
+    --text		ASCII text
 
     More than one output format may be specified.