diff --git a/src/modules/alsa/mixer/profile-sets/hp-tbt-dock-120w-g2.conf b/src/modules/alsa/mixer/profile-sets/hp-tbt-dock-120w-g2.conf
index 3f652816b..a683a4e4e 100644
--- a/src/modules/alsa/mixer/profile-sets/hp-tbt-dock-120w-g2.conf
+++ b/src/modules/alsa/mixer/profile-sets/hp-tbt-dock-120w-g2.conf
@@ -13,9 +13,14 @@
 # You should have received a copy of the GNU Lesser General Public License
 # along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
 
-; HP Thunderbolt Dock Audio Headset
+; HP Thunderbolt Dock 120W G2
 ;
-; This card has one stereo input and one stereo output.
+; This dock has a 3.5mm headset connector. Both input and output are stereo.
+;
+; There's a separate speakerphone module called "HP Thunderbolt Dock Audio
+; Module", which can be attached to this dock. The module will appear in ALSA
+; as a separate USB sound card, configuration for it is in
+; hp-tbt-dock-audio-module.conf.
 
 [General]
 auto-profiles = no
diff --git a/src/modules/alsa/mixer/profile-sets/hp-tbt-dock-audio-module.conf b/src/modules/alsa/mixer/profile-sets/hp-tbt-dock-audio-module.conf
index c03275cbe..692ab8dd0 100644
--- a/src/modules/alsa/mixer/profile-sets/hp-tbt-dock-audio-module.conf
+++ b/src/modules/alsa/mixer/profile-sets/hp-tbt-dock-audio-module.conf
@@ -15,7 +15,12 @@
 
 ; HP Thunderbolt Dock Audio Module
 ;
-; This card has one stereo input and one stereo output.
+; This device attaches to the "HP Thunderbolt Dock 120W G2" dock. The audio
+; module provides a speakerphone with echo cancellation and appears in ALSA as
+; a USB sound card with stereo input and output.
+;
+; The dock itself has a 3.5mm headset connector and appears as a separate USB
+; sound card, configuration for it is in hp-tbt-dock-120w-g2.conf.
 
 [General]
 auto-profiles = no