diff --git a/appendixa/diffutils-desc.sgml b/appendixa/diffutils-desc.sgml
index 74b887a89..e48db4f63 100644
--- a/appendixa/diffutils-desc.sgml
+++ b/appendixa/diffutils-desc.sgml
@@ -30,7 +30,7 @@ diff3 compares 3 files.
 <sect3><title>sdiff</title>
 
 <para>
-sdiff merges two two files and interactively outputs the results.
+sdiff merges two files and interactively outputs the results.
 </para>
 
 </sect3>