-The variable count record has tag code @samp{4}. It consists of two
-integer fields. The first contains the number of variables in the file
-dictionary. The purpose of the second is unknown; it contains the value
-161 in all portable files examined so far.
+The variable count record has tag code @samp{4}. It consists of a
+single integer field giving the number of variables in the file
+dictionary.
+
+@node Precision Record
+@section Precision Record
+
+The precision record has tag code @samp{5}. It consists of a single
+integer field specifying the maximum number of base-30 digits used in
+data in the file.