Update table value with join syntax

I have two tables that have a common field (to join)

Table 1:  Forms
Field 1: FormName (varchar 40)
Field 2: FormDesc (varchar 255)

Table 2: FormsCatalog
Field1: FormName (varchar 40)
Field 2: FormDesc (varchar 255)

I want to join both tables b the FormName, which is the same in both. And update the table 2 field 2 with the value of table 1 field 2

Something like

Update Formscatalog a
set a. FormDesc = b.FormDesc
where a.Formname JOINED TO b.FormName
and Forms as b

Select allOpen in new window

Obviously the syntax is incorrect, this is what I need help with. Simply join the tables by the name and have formscatalog.description be the same as forms.description

Hope I explained myself well.