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-rw-r--r--appendixa/bison-desc.xml4
1 files changed, 4 insertions, 0 deletions
diff --git a/appendixa/bison-desc.xml b/appendixa/bison-desc.xml
index ba1572da6..957ec6a6e 100644
--- a/appendixa/bison-desc.xml
+++ b/appendixa/bison-desc.xml
@@ -9,5 +9,9 @@ for analyzing the structure of text files. Bison is a replacement for yacc
<para><command>yacc</command> is a wrapper for bison, meant for programs
that still call yacc instead of bison. It calls bison with the -y option.</para>
+<para><command>liby.a</command> is the Yacc library containing
+implementations of Yacc-compatible yyerror and main functions. This library
+is normally not very useful, but POSIX requires it.</para>
+
</sect2>