How to enter SPF record in Linode's DNS Manager page

Sorry if this seems like a silly question, but because of the propagation delay, I'm not sure if I'm doing it right.

In the TXT section of the Linode DNS Manager for my domain, I added an entry as follows:

Name:        spf
Value:    "v=spf1 a mx -all"
TTL:        Default

Have I done it right?

When I ran DIG from the terminal, it gave the following output:

root@server:~# dig @ns1.linode.com TXT myDomain.com

; <<>> DiG 9.9.5-3-Ubuntu <<>> @ns1.linode.com TXT myDomain.com
; (2 servers found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 48362
;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1024
;; QUESTION SECTION:
;myDomain.com.                   IN      TXT

;; AUTHORITY SECTION:
myDomain.com.            86400   IN      SOA     ns1.linode.com. webmaster.myDomain.com. 2014120347 14400 14400 1209600 86400

;; Query time: 1 msec
;; SERVER: 2600:3c00::a#53(2600:3c00::a)
;; WHEN: Thu Dec 04 02:49:19 EST 2014
;; MSG SIZE  rcvd: 100

(I can also post, if its useful, the results I received from auth-results@verifier.port25.com.)

Comparing my output to that displayed in another thread here, I seem to be missing a few things and have other extra info:

1) My SPF record is not showing in the ANSWER Section

2) I don't have the Linode DNS servers mentioned in the AUTHORITY Section, though I have 5 entries (ns1 - ns5) in my DNS Manager page.

3) The DNS server record is not shown in the same way in the AUTHORITY Section

I would appreciate any additional advice on configuring the DNS to play nicely with the rest of the net.

Cheers,

Nap