diff --git a/phpBB/includes/functions.php b/phpBB/includes/functions.php
index 762676309c..901caa6f09 100644
--- a/phpBB/includes/functions.php
+++ b/phpBB/includes/functions.php
@@ -4186,7 +4186,7 @@ function phpbb_optionset($bit, $set, $data)
 * For some languages this is not as simple as for English.
 *
 * @param $rule		int			ID of the plural rule we want to use, see http://wiki.phpbb.com/Plural_Rules#Plural_Rules
-* @param $number	int|float	The number we want to get the plural case for
+* @param $number	int|float	The number we want to get the plural case for. Float numbers are floored.
 * @return	int		The plural-case we need to use for the number plural-rule combination
 */
 function phpbb_get_plural_form($rule, $number)
diff --git a/phpBB/includes/session.php b/phpBB/includes/session.php
index eb84cd81fe..808d1a4a7f 100644
--- a/phpBB/includes/session.php
+++ b/phpBB/includes/session.php
@@ -1914,7 +1914,7 @@ class user extends session
 	* Determine which plural form we should use.
 	* For some languages this is not as simple as for English.
 	*
-	* @param $number		int|float	The number we want to get the plural case for
+	* @param $number		int|float	The number we want to get the plural case for. Float numbers are floored.
 	* @param $force_rule	mixed	False to use the plural rule of the language package
 	*								or an integer to force a certain plural rule
 	* @return	int		The plural-case we need to use for the number plural-rule combination