diff --git a/functions/datetime.xml b/functions/datetime.xml
index 2cb532945b..8a2d2d6dde 100644
--- a/functions/datetime.xml
+++ b/functions/datetime.xml
@@ -5,7 +5,7 @@
   <refentry id="function.checkdate">
    <refnamediv>
     <refname>checkdate</refname>
-    <refpurpose>Validate a date/time</refpurpose>
+    <refpurpose>Validate a gregorian date/time</refpurpose>
    </refnamediv>
    <refsect1>
     <title>Description</title>
@@ -24,7 +24,7 @@
      <itemizedlist>
       <listitem>
        <simpara>
-        year is between 0 and 32767 inclusive
+        year is between 1 and 32767 inclusive
        </simpara>
       </listitem>
       <listitem>