diff --git a/user_guide/general/styleguide.html b/user_guide/general/styleguide.html
index b2b681d..1f7a8a0 100644
--- a/user_guide/general/styleguide.html
+++ b/user_guide/general/styleguide.html
@@ -381,7 +381,7 @@
 
 		<h2><a name="compatibility"></a>Compatibility</h2>
 		<div class="guidelineDetails">
-			<p>Unless specifically mentioned in your add-on's documentation, all code must be compatible with PHP version 4.3+.  Additionally, do not use PHP functions that require non-default libraries to be installed unless your code contains an alternative method when the function is not available, or you implicitly document that your add-on requires said PHP libraries.</p>
+			<p>Unless specifically mentioned in your add-on's documentation, all code must be compatible with PHP version 5.1+.  Additionally, do not use PHP functions that require non-default libraries to be installed unless your code contains an alternative method when the function is not available, or you implicitly document that your add-on requires said PHP libraries.</p>
 		</div>