X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=doc%2Fdev%2Fsystem-file-format.texi;h=c1d1e42129a02c5e7fb7dfbf9f6daa528c2550dc;hb=3bbb4370239deb29ebbf813d258aef6249e2a431;hp=a404d0d6ce3961eed3ca1ec134a2ff9f6140adac;hpb=5151983c7f0faf00facba5dfaf6d17947337aa42;p=pspp-builds.git

diff --git a/doc/dev/system-file-format.texi b/doc/dev/system-file-format.texi
index a404d0d6..c1d1e421 100644
--- a/doc/dev/system-file-format.texi
+++ b/doc/dev/system-file-format.texi
@@ -1093,6 +1093,9 @@ value @var{code} - @var{bias}, where
 variable @code{bias} from the file header.  For example,
 code 105 with bias 100.0 (the normal value) indicates a numeric variable
 of value 5.
+One file has been seen written by SPSS 14 that contained such a code
+in a @emph{string} field with the value 0 (after the bias is
+subtracted) as a way of encoding null bytes.
 
 @item 252
 End of file.  This code may or may not appear at the end of the data