diff --git a/core/includes/common.inc b/core/includes/common.inc
index 924d5ec..81a560a 100644
--- a/core/includes/common.inc
+++ b/core/includes/common.inc
@@ -1191,20 +1191,13 @@ function l($text, $path, array $options = array()) {
 }
 
 /**
- * Attempts to set the PHP maximum execution time.
+ * Attempts to increase the PHP maximum execution time.
  *
  * This function is a wrapper around the PHP function set_time_limit().
  * When called, set_time_limit() restarts the timeout counter from zero.
  * In other words, if the timeout is the default 30 seconds, and 25 seconds
- * into script execution a call such as set_time_limit(20) is made, the
- * script will run for a total of 45 seconds before timing out.
- *
- * It also means that it is possible to decrease the total time limit if
- * the sum of the new time limit and the current time spent running the
- * script is inferior to the original time limit. It is inherent to the way
- * set_time_limit() works, it should rather be called with an appropriate
- * value every time you need to allocate a certain amount of time
- * to execute a task than only once at the beginning of the script.
+ * into script execution a call such as set_time_limit(40) is made, the
+ * script will run for a total of 65 seconds before timing out.
  *
  * Before calling set_time_limit(), we check if this function is available
  * because it could be disabled by the server administrator. We also hide all