diff --git a/LICENSE b/LICENSE
index cf1ab25..10800c5 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,3 +1,5 @@
+Unless otherwise stated:
+
 This is free and unencumbered software released into the public domain.
 
 Anyone is free to copy, modify, publish, use, compile, sell, or
@@ -22,3 +24,19 @@ ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 OTHER DEALINGS IN THE SOFTWARE.
 
 For more information, please refer to <http://unlicense.org>
+
+
+
+--------------------------------------------------------------------------
+
+Some audio files are licensed under CC BY 3.0, as noted in the file name.
+See the file metadata for attribution.
+
+https://creativecommons.org/licenses/by/3.0/
+
+
+--------------------------------------------------------------------------
+
+Audio files with "PD" in the file name are in the Public Domain.
+See the file metadata for source information.
+
diff --git a/init.lua b/init.lua
index 09b7c41..ee2f163 100644
--- a/init.lua
+++ b/init.lua
@@ -7,6 +7,17 @@ storms = {
 }
 
 
+local sounds = {
+	thunder = {
+		"thunder_01_ccby_hantorio.ogg",
+		"thunder_02_PD.ogg",
+		"thunder_03_PD.ogg",
+	},
+}
+
+
+
+
 storms.register_on_lightning_strike = function(fn) 
 	table.insert(on_strike, fn)
 end
@@ -117,6 +128,12 @@ local function do_lightning(cloudh, pos)
 		p.y = p.y - 1
 	end
 	
+	minetest.sound_play(sounds.thunder[math.random(#sounds.thunder)], {
+		pos = p,
+		max_hear_distance = 100,
+		gain = 10.0,
+	})
+	
 end
 
 
diff --git a/sounds/storms_thunder_01_ccby_hantorio.ogg b/sounds/storms_thunder_01_ccby_hantorio.ogg
new file mode 100644
index 0000000..5cb862e
Binary files /dev/null and b/sounds/storms_thunder_01_ccby_hantorio.ogg differ
diff --git a/sounds/storms_thunder_02_PD.ogg b/sounds/storms_thunder_02_PD.ogg
new file mode 100644
index 0000000..6248a7b
Binary files /dev/null and b/sounds/storms_thunder_02_PD.ogg differ
diff --git a/sounds/storms_thunder_03_PD.ogg b/sounds/storms_thunder_03_PD.ogg
new file mode 100644
index 0000000..42bde7c
Binary files /dev/null and b/sounds/storms_thunder_03_PD.ogg differ