diff --git a/htdocs/core/lib/product.lib.php b/htdocs/core/lib/product.lib.php
index f58af3500c0..54555eb018c 100644
--- a/htdocs/core/lib/product.lib.php
+++ b/htdocs/core/lib/product.lib.php
@@ -504,7 +504,7 @@ function measuring_units_string($scale = '', $measuring_style = '', $unit = 0, $
  *	Return translation label of a unit key
  *
  *	@param	int		$unit                ID of unit (rowid in llx_c_units table)
- *	@param  string	$measuring_style     Style of unit: weight, volume,...
+ *	@param  string	$measuring_style     Style of unit: 'weight', 'volume', ..., '' = 'net_measure' for option PRODUCT_ADD_NET_MEASURE
  *  @param	string  $scale				 Scale of unit: '0', '-3', '6', ...
  *  @param	int		$use_short_label	 1=Use short label ('g' instead of 'gram'). Short labels are not translated.
  *	@return	string	   			         Unit string