diff --git a/chapter06/glibc-exp.xml b/chapter06/glibc-exp.xml
index 1237fc77f..b1a154d97 100644
--- a/chapter06/glibc-exp.xml
+++ b/chapter06/glibc-exp.xml
@@ -17,7 +17,7 @@ searches through <filename>malloc/Makefile</filename> and
 converts all occurances of <filename>$(PERL)</filename> to
 <filename>/usr/bin/perl</filename>.  The output is then written to the
 file <filename>tmp~</filename>.  This is done because Glibc can't
-autodetect perl since it's not installed yet.</para>
+autodetect perl since it hasn't been installed yet.</para>
 
 <para><userinput>mv tmp~ malloc/Makefile:</userinput> The file
 <filename>tmp~</filename> is now moved back to