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diff --git a/doc/data-io.texi b/doc/data-io.texi
index 313e543205..cd0fc6386b 100644
--- a/doc/data-io.texi
+++ b/doc/data-io.texi
@@ -484,7 +484,10 @@ where each @var{var_spec} takes one of the forms
 @end display
 
 In free format, the input data is, by default, structured as a series
-of fields separated by spaces, tabs, commas, or line breaks.  Each
+of fields separated by spaces, tabs, or line breaks.
+If the current @subcmd{DECIMAL} separator is @subcmd{DOT} (@pxref{SET}),
+then commas are also treated as field separators.
+Each
 field's content may be unquoted, or it may be quoted with a pairs of
 apostrophes (@samp{'}) or double quotes (@samp{"}).  Unquoted white
 space separates fields but is not part of any field.  Any mix of
@@ -795,6 +798,9 @@ so an infinite loop results.  @cmd{END FILE}, when executed,
 stops the flow of input data and passes out of the @cmd{INPUT PROGRAM}
 structure.
 
+@cmd{INPUT PROGRAM} must contain at least one @cmd{DATA LIST} or
+@cmd{END FILE} command.
+
 All this is very confusing.  A few examples should help to clarify.
 
 @c If you change this example, change the regression test1 in
@@ -939,10 +945,6 @@ currently not used.
 Case numbers start from 1.  They are counted after all transformations
 have been considered.
 
-@cmd{LIST} attempts to fit all the values on a single line.  If needed
-to make them fit, variable names are displayed vertically.  If values
-cannot fit on a single line, then a multi-line format will be used.
-
 @cmd{LIST} is a procedure.  It causes the data to be read.
 
 @node NEW FILE