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diff --git a/doc/variables.texi b/doc/variables.texi
index 95a5b67b..c9e270bf 100644
--- a/doc/variables.texi
+++ b/doc/variables.texi
@@ -212,9 +212,10 @@ As part of a range, LO or LOWEST may take the place of num1;
 HI or HIGHEST may take the place of num2.
 @end display
 
-@cmd{MISSING VALUES} sets user-missing values for numeric and
-short string variables.  Long string variables may not have missing
-values.
+@cmd{MISSING VALUES} sets user-missing values for numeric and string
+variables.  Long string variables may have missing values, but
+characters after the first 8 bytes of the missing value must be
+spaces.
 
 Specify a list of variables, followed by a list of their user-missing
 values in parentheses.  Up to three discrete values may be given, or,
@@ -342,8 +343,7 @@ stand for a long value.
 
 To set up value labels for a set of variables, specify the
 variable names after a slash (@samp{/}), followed by a list of values
-and their associated labels, separated by spaces.  Long string
-variables may not be specified.
+and their associated labels, separated by spaces.
 
 Before @cmd{VALUE LABELS} is executed, any existing value labels
 are cleared from the variables specified.  Use @cmd{ADD VALUE LABELS}
@@ -417,7 +417,7 @@ the latter case, all the array elements numbered higher than the
 deleted element are shifted down, filling the vacated position.
 
 To associate custom attributes with the entire active file, instead of
-with particular variables, use @cmd{DATAFILE ATTRIBUTE} instead.
+with particular variables, use @cmd{DATAFILE ATTRIBUTE} (@pxref{DATAFILE ATTRIBUTE}) instead.
 
 @cmd{VARIABLE ATTRIBUTE} takes effect immediately.  It is not affected
 by conditional and looping structures such as @cmd{DO IF} or
@@ -555,4 +555,3 @@ variables
 to the specified format specification.  Its syntax is identical to
 that of FORMATS (@pxref{FORMATS}), but @cmd{WRITE FORMATS} sets only
 write formats, not print formats.
-@setfilename ignored