diff --git a/prologue/why.xml b/prologue/why.xml
index 1cc8c9bba..6f63b1375 100644
--- a/prologue/why.xml
+++ b/prologue/why.xml
@@ -544,7 +544,7 @@
 
         <para>This package contains programs for compressing and decompressing
         files.  It provides the highest compression generally available
-        and is useful for decompressing packages XZ or LZMA format.</para>
+        and is useful for decompressing packages in XZ or LZMA format.</para>
       </listitem>
 
       <listitem>