+@c PSPP - a program for statistical analysis.
+@c Copyright (C) 2019 Free Software Foundation, Inc.
+@c Permission is granted to copy, distribute and/or modify this document
+@c under the terms of the GNU Free Documentation License, Version 1.3
+@c or any later version published by the Free Software Foundation;
+@c with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
+@c A copy of the license is included in the section entitled "GNU
+@c Free Documentation License".
+@c
+
@node Portable File Format
@appendix Portable File Format
* Version and Date Info Record::
* Identification Records::
* Variable Count Record::
+* Precision Record::
* Case Weight Variable Record::
* Variable Records::
* Value Label Records::
@node Variable Count Record
@section Variable Count Record
-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.
@node Case Weight Variable Record
@section Case Weight Variable Record