doc: Document that value labels are case sensitive.

[pspp] / doc / variables.texi

diff --git a/doc/variables.texi b/doc/variables.texi
index 1db8f034a66fc79c5334addb348e6baed606d92f..68a996681d1db8830c4d256ab65c15ff2d701947 100644 (file)
--- a/doc/variables.texi
+++ b/doc/variables.texi
@@ -434,6 +434,8 @@ variable names, separated by an equals sign (@samp{=}), within
 parentheses.  There must be the same number of old and new variable
 names.  Each old variable is renamed to the corresponding new variable
 name.  Multiple parenthesized groups of variables may be specified.
+When the old and new variable names contain only a single variable name,
+the parentheses are optional.
 
 @cmd{RENAME VARIABLES} takes effect immediately.  It does not cause the data
 to be read.
@@ -450,11 +452,16 @@ VALUE LABELS
         /@var{var_list} @var{value} '@var{label}' [@var{value} '@var{label}']@dots{}
 @end display
 
-@cmd{VALUE LABELS} allows values of numeric and short string
+@cmd{VALUE LABELS} allows values of
 variables to be associated with labels.  In this way, a short value can
-stand for a long value.
+stand for a longer, more descriptive label.
 
-To set up value labels for a set of variables, specify the
+Both numeric and string variables can be given labels.  For string
+variables, the values are case-sensitive, so that, for example, a
+capitalized value and its lowercase variant would have to be labeled
+separately if both are present in the data.
+
+To set up value labels for one or more variables, specify the
 variable names after a slash (@samp{/}), followed by a list of values
 and their associated labels, separated by spaces.