Documented issue and todo

doc/align-operator.txt

@@ -60,11 +60,15 @@ inconsistent if 'tabstop' is changed (e.g. in someone else's text editor).
 This may also be the case if tabs are mixed with spaces or used after the
 first non-whitespace character on the line.
 
+{char} is interpreted as a single character pattern, so a command like
+"gli{." will not work.
+
 TODO                                            *align-operator-todo*
 
 1. Compute virtual position of {char} more accurately by considering whether
    the column of occurrences of <Tab> characters aligns with a tab column.
 2. Add support for |blockwise-visual| mode.
+3. Interpret {char} as a literal character instead of a pattern.
 
 MY LOVE                                         *align-operator-my-love*