diff --git a/htdocs/core/lib/admin.lib.php b/htdocs/core/lib/admin.lib.php
index 9661f619055..447a3111e10 100644
--- a/htdocs/core/lib/admin.lib.php
+++ b/htdocs/core/lib/admin.lib.php
@@ -44,9 +44,10 @@ function versiontostring($versionarray)
 /**
  *	Compare 2 versions (stored into 2 arrays).
  *  To check if Dolibarr version is lower than (x,y,z), do "if versioncompare(versiondolibarrarray(), array(x.y.z)) <= 0"
- *  For example: if (versioncompare(versiondolibarrarray(),array(4,0,-4)) >= 0) is true if version is 4.0 beta or higher.
+ *  For example: if (versioncompare(versiondolibarrarray(),array(4,0,-4)) >= 0) is true if version is 4.0 alpha or higher.
  *  For example: if (versioncompare(versiondolibarrarray(),array(4,0,0)) >= 0) is true if version is 4.0 final or higher.
  *  For example: if (versioncompare(versiondolibarrarray(),array(4,0,1)) >= 0) is true if version is 4.0.1 or higher.
+ *  Alternative way to compare: if ((float) DOL_VERSION >= 4.0) is true if version is 4.0 alpha or higher (works only to compare first and second level)
  *
  *	@param      array		$versionarray1      Array of version (vermajor,verminor,patch)
  *	@param      array		$versionarray2		Array of version (vermajor,verminor,patch)