diff --git a/transaction.go b/transaction.go
index 7f8c2d1..1bb5229 100644
--- a/transaction.go
+++ b/transaction.go
@@ -257,6 +257,14 @@ const (
 	Ruser Item = C.PAM_RUSER
 	// UserPrompt is the string use to prompt for a username.
 	UserPrompt Item = C.PAM_USER_PROMPT
+	// FailDelay is the app supplied function to override failure delays.
+	FailDelay Item = C.PAM_FAIL_DELAY
+	// Xdisplay is the X display name
+	Xdisplay Item = C.PAM_XDISPLAY
+	// Xauthdata is the X server authentication data.
+	Xauthdata Item = C.PAM_XAUTHDATA
+	// AuthtokType is the type for pam_get_authtok
+	AuthtokType Item = C.PAM_AUTHTOK_TYPE
 )
 
 // SetItem sets a PAM information item.