diff --git a/docs/manual.adoc b/docs/manual.adoc
index 1d8d88a..56ebc07 100644
--- a/docs/manual.adoc
+++ b/docs/manual.adoc
@@ -934,9 +934,9 @@ long long xml_attribute::as_llong(long long def = 0) const;
 unsigned long long xml_attribute::as_ullong(unsigned long long def = 0) const;
 ----
 
-`as_int`, `as_uint`, `as_llong`, `as_ullong`, `as_double` and `as_float` convert attribute values to numbers. If attribute handle is null or attribute value is empty, `def` argument is returned (which is 0 by default). Otherwise, all leading whitespace characters are truncated, and the remaining string is parsed as an integer number in either decimal or hexadecimal form (applicable to `as_int`, `as_uint`, `as_llong` and `as_ullong`; hexadecimal format is used if the number has `0x` or `0X` prefix) or as a floating point number in either decimal or scientific form (`as_double` or `as_float`). Any extra characters are silently discarded, i.e. `as_int` will return `1` for string `"1abc"`.
+`as_int`, `as_uint`, `as_llong`, `as_ullong`, `as_double` and `as_float` convert attribute values to numbers. If attribute handle is null `def` argument is returned (which is 0 by default). Otherwise, all leading whitespace characters are truncated, and the remaining string is parsed as an integer number in either decimal or hexadecimal form (applicable to `as_int`, `as_uint`, `as_llong` and `as_ullong`; hexadecimal format is used if the number has `0x` or `0X` prefix) or as a floating point number in either decimal or scientific form (`as_double` or `as_float`).
 
-In case the input string contains a number that is out of the target numeric range, the result is undefined.
+In case the input string contains a non-numeric character sequence or a number that is out of the target numeric range, the result is undefined.
 
 CAUTION: Number conversion functions depend on current C locale as set with `setlocale`, so may return unexpected results if the locale is different from `"C"`.
 
diff --git a/docs/manual.html b/docs/manual.html
index 7d3a87a..588fc1a 100644
--- a/docs/manual.html
+++ b/docs/manual.html
@@ -2105,10 +2105,10 @@ In many cases attribute values have types that are not strings - i.e. an attribu
 </div>
 </div>
 <div class="paragraph">
-<p><code>as_int</code>, <code>as_uint</code>, <code>as_llong</code>, <code>as_ullong</code>, <code>as_double</code> and <code>as_float</code> convert attribute values to numbers. If attribute handle is null or attribute value is empty, <code>def</code> argument is returned (which is 0 by default). Otherwise, all leading whitespace characters are truncated, and the remaining string is parsed as an integer number in either decimal or hexadecimal form (applicable to <code>as_int</code>, <code>as_uint</code>, <code>as_llong</code> and <code>as_ullong</code>; hexadecimal format is used if the number has <code>0x</code> or <code>0X</code> prefix) or as a floating point number in either decimal or scientific form (<code>as_double</code> or <code>as_float</code>). Any extra characters are silently discarded, i.e. <code>as_int</code> will return <code>1</code> for string <code>"1abc"</code>.</p>
+<p><code>as_int</code>, <code>as_uint</code>, <code>as_llong</code>, <code>as_ullong</code>, <code>as_double</code> and <code>as_float</code> convert attribute values to numbers. If attribute handle is null <code>def</code> argument is returned (which is 0 by default). Otherwise, all leading whitespace characters are truncated, and the remaining string is parsed as an integer number in either decimal or hexadecimal form (applicable to <code>as_int</code>, <code>as_uint</code>, <code>as_llong</code> and <code>as_ullong</code>; hexadecimal format is used if the number has <code>0x</code> or <code>0X</code> prefix) or as a floating point number in either decimal or scientific form (<code>as_double</code> or <code>as_float</code>).</p>
 </div>
 <div class="paragraph">
-<p>In case the input string contains a number that is out of the target numeric range, the result is undefined.</p>
+<p>In case the input string contains a non-numeric character sequence or a number that is out of the target numeric range, the result is undefined.</p>
 </div>
 <div class="admonitionblock caution">
 <table>
@@ -5588,7 +5588,7 @@ If exceptions are disabled, then in the event of parsing failure the query is in
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 <div id="footer">
 <div id="footer-text">
-Last updated 2015-12-31 17:18:47 MSK
+Last updated 2016-01-19 08:45:46 PST
 </div>
 </div>
 </body>