Added increment_string() docs and changelog.
diff --git a/user_guide/changelog.html b/user_guide/changelog.html
index 8f0fad7..20b1c4e 100644
--- a/user_guide/changelog.html
+++ b/user_guide/changelog.html
@@ -70,6 +70,7 @@
</li>
<li>Helpers
<ul>
+ <li class="reactor">Added <samp>increment_string()</samp> to <a href="helpers/string_helper.html">String Helper</a> to turn "foo" into "foo-1" or "foo-1" into "foo-2".</li>
</ul>
</li>
<li>Database
diff --git a/user_guide/helpers/string_helper.html b/user_guide/helpers/string_helper.html
index 169ee4e..7c1d30c 100644
--- a/user_guide/helpers/string_helper.html
+++ b/user_guide/helpers/string_helper.html
@@ -90,6 +90,17 @@
<code>echo random_string('alnum', 16);</code>
+<h2>increment_string()</h2>
+
+<p>Increments a string by appending a number to it or increasing the number. Useful for creating "copies" or a file or duplicating database content which has unique titles or slugs.</p>
+
+<p>Usage example:</p>
+
+<code>echo increment_string('file', '_'); // "file_1"<br/>
+echo increment_string('file', '-', 2); // "file-2"<br/>
+echo increment_string('file-4'); // "file-5"<br/></code>
+
+
<h2>alternator()</h2>
<p>Allows two or more items to be alternated between, when cycling through a loop. Example:</p>