diff --git a/markdown.3 b/markdown.3
index c516a56..fe8aac4 100644
--- a/markdown.3
+++ b/markdown.3
@@ -104,6 +104,10 @@ blocks.
 Forbid alphabetic lists.
 .It Ar MKD_NODLIST
 Forbid definition lists.
+.It Ar MKD_NODLDISCOUNT
+Disable the discount definition list syntax style.
+.It Ar MKD_DLEXTRA
+Enable the extra definition list syntax style.
 .It Ar MKD_EXTRA_FOOTNOTE
 Enable markdown extra-style footnotes.
 .It Ar MKD_NOSTYLE