diff --git a/htdocs/langs/en_US/admin.lang b/htdocs/langs/en_US/admin.lang
index e3aec89e613..e14e15033d6 100644
--- a/htdocs/langs/en_US/admin.lang
+++ b/htdocs/langs/en_US/admin.lang
@@ -422,6 +422,8 @@ ExtrafieldCheckBoxFromList=Checkboxes from table
ExtrafieldLink=Link to an object
ComputedFormula=Computed field
ComputedFormulaDesc=You can enter here a formula using other properties of object or any PHP coding to get a dynamic computed value. You can use any PHP compatible formulas including the "?" condition operator, and following global object: $db, $conf, $langs, $mysoc, $user, $object. WARNING: Only some properties of $object may be available. If you need a properties not loaded, just fetch yourself the object into your formula like in the second example. Using a computed field means you can't enter yourself any value from interface. Also, if there is a syntax error, the formula may return nothing.
Example to reload object (($reloadedobj = new Societe($db)) && ($reloadedobj->fetch($obj->id ? $obj->id: ($obj->rowid ? $obj->rowid: $object->id)) > 0)) ? $reloadedobj->array_options['options_extrafieldkey'] * $reloadedobj->capital / 5: '-1'
Other example of formula to force load of object and its parent object: (($reloadedobj = new Task($db)) && ($reloadedobj->fetch($object->id) > 0) && ($secondloadedobj = new Project($db)) && ($secondloadedobj->fetch($reloadedobj->fk_project) > 0)) ? $secondloadedobj->ref: 'Parent project not found'
+Computedpersistent=Store computed field
+ComputedpersistentDesc=Computed extra fields will be stored in the database, however, the value will only be recalculated when the object of this field is changed. If the computed field depends on other objects or global data this value might be wrong!!
ExtrafieldParamHelpPassword=Leaving this field blank means this value will be stored without encryption (field must be only hidden with star on screen). Set 'auto' to use the default encryption rule to save password into database (then value read will be the hash only, no way to retrieve original value)
ExtrafieldParamHelpselect=List of values must be lines with format key,value (where key can't be '0')
for example: 1,value1 2,value2 code3,value3 ...
In order to have the list depending on another complementary attribute list: 1,value1|options_parent_list_code:parent_key 2,value2|options_parent_list_code:parent_key
In order to have the list depending on another list: 1,value1|parent_list_code:parent_key 2,value2|parent_list_code:parent_key
ExtrafieldParamHelpcheckbox=List of values must be lines with format key,value (where key can't be '0')
for example: 1,value1 2,value2 3,value3 ...
@@ -1925,4 +1927,4 @@ UrlForIFTTT=URL endpoint for IFTTT
YouWillFindItOnYourIFTTTAccount=You will find it on your IFTTT account
EndPointFor=End point for %s : %s
DeleteEmailCollector=Delete email collector
-ConfirmDeleteEmailCollector=Are you sure you want to delete this email collector?
\ No newline at end of file
+ConfirmDeleteEmailCollector=Are you sure you want to delete this email collector?