diff --git a/atlassian-connect-descriptor.cabal b/atlassian-connect-descriptor.cabal
--- a/atlassian-connect-descriptor.cabal
+++ b/atlassian-connect-descriptor.cabal
@@ -10,7 +10,7 @@
 -- PVP summary:      +-+------- breaking API changes
 --                   | | +----- non-breaking API additions
 --                   | | | +--- code changes with no API change
-version:             0.4.4.2
+version:             0.4.5.0
 
 -- A short (one-line) description of the package.
 synopsis:            Code that helps you create a valid Atlassian Connect Descriptor.
diff --git a/src/Data/Connect/Scopes.hs b/src/Data/Connect/Scopes.hs
--- a/src/Data/Connect/Scopes.hs
+++ b/src/Data/Connect/Scopes.hs
@@ -23,6 +23,7 @@
   | SpaceAdmin -- ^ A Confluence specific scope. Lets your add-on administer a space in Confluence.
   | Admin -- ^ Gives your Atlassian Connect add-on administrative rights to the Cloud instance. (But NOT system
           -- administrator permission. Happily you cannot request that level of access.)
+  | ActAsUser -- ^ Add-ons with this scope can access resources and perform actions in JIRA and Confluence on behalf of users.
   deriving (Show, Eq, Generic)
 
 instance ToJSON ProductScope where
@@ -32,6 +33,7 @@
    toJSON ProjectAdmin = "project_admin"
    toJSON SpaceAdmin   = "space_admin"
    toJSON Admin        = "admin"
+   toJSON ActAsUser    = "act_as_user"
 
 instance FromJSON ProductScope where
   parseJSON (String "read")             = return Read
@@ -40,4 +42,5 @@
   parseJSON (String "project_admin")    = return ProjectAdmin
   parseJSON (String "space_admin")      = return SpaceAdmin
   parseJSON (String "admin")            = return Admin
+  parseJSON (String "act_as_user")      = return ActAsUser
   parseJSON _                           = mzero