===================================================================
RCS file: /cvs/mandoc/TODO,v
retrieving revision 1.237
retrieving revision 1.238
diff -u -p -r1.237 -r1.238
--- mandoc/TODO	2017/05/16 19:06:30	1.237
+++ mandoc/TODO	2017/06/23 22:20:17	1.238
@@ -1,6 +1,6 @@
 ************************************************************************
 * Official mandoc TODO.
-* $Id: TODO,v 1.237 2017/05/16 19:06:30 schwarze Exp $
+* $Id: TODO,v 1.238 2017/06/23 22:20:17 schwarze Exp $
 ************************************************************************
 
 Many issues are annotated for difficulty as follows:
@@ -239,6 +239,13 @@ are mere guesses, and some may be wrong.
 - Mark and lineup are parsed and ignored,
   see User's Guide (Second Edition) page 5 section 15.
   loc **  exist **  algo **  size **  imp **
+
+- GNU eqn converts some operators to special characters, for example,
+  input HYPHEN-MINUS becomes output \(mi, unless it is part of a
+  quoted word.  mandoc(1) only does this when the operator is
+  surrounded by blanks, not when it is part of an unquoted word.
+  Also, check whether there are more such cases (e.g., +?).
+  reported by bentley@  20 Jun 2017 02:04:29 -0600
 
 --- missing misc features ----------------------------------------------