diff --git a/chapters.ent b/chapters.ent
index 8d48b73096..ccf9fe7f06 100644
--- a/chapters.ent
+++ b/chapters.ent
@@ -72,6 +72,7 @@
 <!ENTITY reference.oracle            SYSTEM "functions/oracle.xml">
 <!ENTITY reference.pcre              SYSTEM "functions/pcre.xml">
 <!ENTITY reference.pdf               SYSTEM "functions/pdf.xml">
+<!ENTITY reference.pfpro             SYSTEM "functions/pfpro.xml">
 <!ENTITY reference.posix             SYSTEM "functions/posix.xml">
 <!ENTITY reference.recode            SYSTEM "functions/recode.xml">
 <!ENTITY reference.info              SYSTEM "functions/info.xml">
diff --git a/functions/pfpro.xml b/functions/pfpro.xml
index 27a664f163..83a60bae64 100644
--- a/functions/pfpro.xml
+++ b/functions/pfpro.xml
@@ -29,7 +29,7 @@
     of transactions using <function>pfpro_process</function> between the two.
    </simpara>
    <simpara>
-    These functions have been added in PHP 4.02.
+    These functions have been added in PHP 4.0.2.
    </simpara>
   </partintro>