diff --git a/chapter06/mpfr.xml b/chapter06/mpfr.xml
index 39446af81..40ddff135 100644
--- a/chapter06/mpfr.xml
+++ b/chapter06/mpfr.xml
@@ -54,7 +54,7 @@
       Do not skip it under any circumstances.</para>
     </important>
 
-    <para>Test the results:</para>
+    <para>Test the results and ensure that all 134 tests passed:</para>
 
 <screen><userinput remap="test">make check</userinput></screen>