-@lilypond[verbatim,quote,relative=2]
-a4 \open
-a^\markup { \teeny "II" }
-a2^\markup { \small "sul A" }
+Roman numerals can be added as strings numbers (rather
+than the default circled Arabic numbers), as explained in
+@ref{String number indications}.
+
+Alternatively, string indications may be printed using
+markup commands; articulation scripts may also indicate
+open strings.
+
+@lilypond[verbatim,quote,fragment]
+a'4 \open
+\romanStringNumbers
+a'\2
+a'2^\markup { \small "sul A" }