diff --git a/reference/stats/functions/stats-standard-deviation.xml b/reference/stats/functions/stats-standard-deviation.xml
index c571eae4f1..3d029de767 100644
--- a/reference/stats/functions/stats-standard-deviation.xml
+++ b/reference/stats/functions/stats-standard-deviation.xml
@@ -13,8 +13,6 @@
    <methodparam choice="opt"><type>bool</type><parameter>sample</parameter><initializer>false</initializer></methodparam>
   </methodsynopsis>
 
-  &warn.undocumented.func;
-
  </refsect1>
  <refsect1 role="parameters">
   &reftitle.parameters;
@@ -24,6 +22,8 @@
      <term><parameter>a</parameter></term>
      <listitem>
       <para>
+       The array of data to find the standard deviation for. Note that all 
+       values of the array will be cast to <type>float</type>.
       </para>
      </listitem>
     </varlistentry>
@@ -31,6 +31,8 @@
      <term><parameter>sample</parameter></term>
      <listitem>
       <para>
+       Indicates if <parameter>a</parameter> represents a sample of the 
+       population; defaults to false.
       </para>
      </listitem>
     </varlistentry>
@@ -41,18 +43,17 @@
  <refsect1 role="returnvalues">
   &reftitle.returnvalues;
   <para>
+   Returns the standard deviation on success; <type>false</type> on failure.
   </para>
  </refsect1>
 
- <!-- Use when ERRORS exist
- <refsect1 role="errors">
+ <refsect1 role="errors"><!-- {{{ -->
   &reftitle.errors;
   <para>
-   When does this function throw E_* level errors, or exceptions?
+   Raises an E_WARNING when there are fewer than 2 values in 
+   <parameter>a</parameter>.
   </para>
- </refsect1>
- -->
-
+ </refsect1><!-- }}} -->
 
  <!-- Use when a CHANGELOG exists
  <refsect1 role="changelog">