diff --git a/src/info/ata4/bsplib/app/appdb.xml b/src/info/ata4/bsplib/app/appdb.xml
index afc1135a..55fb882e 100644
--- a/src/info/ata4/bsplib/app/appdb.xml
+++ b/src/info/ata4/bsplib/app/appdb.xml
@@ -146,6 +146,117 @@
             info_player_axis
         </entities>
     </app>
+    <app name="Half-Life: Source" id="280">
+        <version min="19" max="19" />
+        <files><![CDATA[^c[0-5]a[0-5][a-z]$]]></files>
+        <!-- The entity list for Half-Life: Source is mostly identical to that of
+             Half-Life. Some are available in all Source games, but are virtually
+             unused outside Half-Life: Source due to their legacy status.
+             
+             Half-Life Deathmatch: Source maps are barely distinguishable from
+             HL2:DM and HL1:S maps due to the lack of prefixes and special
+             entities, so there's no separate entry for this game.
+        -->
+        <entities points="5">
+            ammo_357
+            ammo_9mmAR
+            ammo_9mmclip
+            ammo_ARgrenades
+            ammo_buckshot
+            ammo_crossbow
+            ammo_gaussclip
+            ammo_glockclip
+            ammo_mp5clip
+            ammo_mp5grenades
+            ammo_rpgclip
+            env_beverage
+            env_blood
+            env_glow
+            env_render
+            env_sound
+            func_friction
+            func_guntarget
+            func_healthcharger
+            func_monsterclip
+            func_mortar_field
+            func_pendulum
+            func_pushable
+            func_recharge
+            func_tanklaser
+            func_water
+            info_bigmomma
+            item_longjump
+            momentary_door
+            monster_alien_controller
+            monster_alien_grunt
+            monster_alien_slave
+            monster_apache
+            monster_barnacle
+            monster_barney
+            monster_barney_dead
+            monster_bigmomma
+            monster_bullchicken
+            monster_cockroach
+            monster_flyer_flock
+            monster_furniture
+            monster_gargantua
+            monster_gman
+            monster_headcrab
+            monster_hevsuit_dead
+            monster_hgrunt_dead
+            monster_houndeye
+            monster_human_assassin
+            monster_human_grunt
+            monster_ichthyosaur
+            monster_leech
+            monster_miniturret
+            monster_nihilanth
+            monster_osprey
+            monster_rat
+            monster_scientist
+            monster_scientist_dead
+            monster_sentry
+            monster_sitting_scientist
+            monster_snark
+            monster_tentacle
+            monster_tripmine
+            monster_turret
+            monster_zombie
+            monstermaker
+            multi_manager
+            scripted_sentence
+            speaker
+            target_cdaudio
+            trigger_auto
+            trigger_camera
+            trigger_cdaudio
+            trigger_endsection
+            trigger_relay
+            trigger_togglesave
+            weapon_357
+            weapon_crossbow
+            weapon_crowbar
+            weapon_egon
+            weapon_gauss
+            weapon_glock
+            weapon_handgrenade
+            weapon_hornetgun
+            weapon_mp5
+            weapon_rpg
+            weapon_satchel
+            weapon_shotgun
+            weapon_snark
+            weapon_tripmine
+            weaponbox
+            world_items
+            xen_hair
+            xen_plantlight
+            xen_spore_large
+            xen_spore_medium
+            xen_spore_small
+            xen_tree
+        </entities>
+    </app>
     <app name="Half-Life 2: Deathmatch" id="320">
         <version min="19" max="20" />
         <files><![CDATA[^dm_]]></files>