diff --git a/README.txt b/README.txt
index 84f62cbc..26e403b2 100644
--- a/README.txt
+++ b/README.txt
@@ -26,7 +26,7 @@ because the feature doesn't work yet :P
 Requirements
 ~~~~~~~~~~~~
 MySQL 5.1+ (with experimental support for PostgreSQL 8+ and SQLite 3)
-PHP 5.2+
+PHP 5.2.6+
 GD or ImageMagick
 
 
diff --git a/core/util.inc.php b/core/util.inc.php
index a01c52b2..e9a8583d 100644
--- a/core/util.inc.php
+++ b/core/util.inc.php
@@ -907,12 +907,7 @@ $_load_start = microtime(true);
 function get_debug_info() {
 	global $config, $_event_count, $database, $_execs, $_load_start;
 
-	if(function_exists('memory_get_usage')) {
-		$i_mem = sprintf("%5.2f", ((memory_get_usage()+512)/1024)/1024);
-	}
-	else {
-		$i_mem = "???";
-	}
+	$i_mem = sprintf("%5.2f", ((memory_get_peak_usage(true)+512)/1024)/1024);
 
 	if($config->get_string("commit_hash", "unknown") == "unknown"){
 		$commit = "";