Index: doc/info.man.inc
===================================================================
diff -u -r846829faf86d04ad2add40bfb85ad770440ec3cb -r497451f32e6bd57a366800f0851789d555feaca8
--- doc/info.man.inc	(.../info.man.inc)	(revision 846829faf86d04ad2add40bfb85ad770440ec3cb)
+++ doc/info.man.inc	(.../info.man.inc)	(revision 497451f32e6bd57a366800f0851789d555feaca8)
@@ -28,9 +28,16 @@
 [call [arg [vset CMD]] [method "info [vset MODIFIER] method"] [arg option] [arg methodName]]
 
 This introspection [term "submethod"] provides access to the details
-of [arg methodName] provided by [arg [vset CMD]]. Permitted values for
-[arg option] are:
+of [arg methodName] provided by [arg [vset CMD]]. If [arg methodName]
+is not the name of an existing method, an empty string is returned. To
+disambiguate between a non-existing method and an empty string as
+valid return value (e.g., for [method "info [vset MODIFIER] method args|parameters|args|..."]),
+use [method "info [vset MODIFIER] method exists"].
 
+[para]
+
+Permitted values for [arg option] are:
+
 [list_begin itemized]
 
 [item] [const args] returns a list containing the parameter names of