diff --git a/en_US.ISO8859-1/books/handbook/introduction/chapter.xml b/en_US.ISO8859-1/books/handbook/introduction/chapter.xml
index abda4b25fc..2a7a891d9d 100644
--- a/en_US.ISO8859-1/books/handbook/introduction/chapter.xml
+++ b/en_US.ISO8859-1/books/handbook/introduction/chapter.xml
@@ -136,6 +136,10 @@
 	      <primary>binary compatibility</primary>
 	      <secondary>Linux</secondary>
 	    </indexterm>
+	    <indexterm>
+	      <primary>binary compatibility</primary>
+	      <secondary>SCO</secondary>
+	    </indexterm>
 	    <indexterm>
 	      <primary>binary compatibility</primary>
 	      <secondary>SVR4</secondary>
@@ -149,7 +153,7 @@
 	      <secondary>NetBSD</secondary>
 	    </indexterm>
 	    <emphasis>Binary compatibility</emphasis> with many
-	    programs built for Linux, SVR4, BSDI and
+	    programs built for Linux, SCO, SVR4, BSDI and
 	    NetBSD.</para>
 	</listitem>