diff --git a/docs/AUTHORS.txt b/docs/AUTHORS.txt
index acf264ef6..571eb870a 100644
--- a/docs/AUTHORS.txt
+++ b/docs/AUTHORS.txt
@@ -6,7 +6,7 @@ Copyright (c) 2002-2023
 Various contributors (see below, and CHANGES.txt)
 https://tuxpaint.org/
 
-June 17, 2002 - March 8, 2023
+June 17, 2002 - March 22, 2023
 
 * Design and Coding:
 
@@ -141,7 +141,7 @@ June 17, 2002 - March 8, 2023
   (https://freesound.org/people/kentnelson64/sounds/647221/)
   Creative Commons 0 license by "kentnelson64"
 
-  3D Glasses & Color Sep. magic tools
+  3D Glasses, Color Sep., & Double Vision magic tools
   by Bill Kendrick <bill@newbreedsoftware.com>
 
   3D Glasses sound effect: "Sci-Fi Sensors"
@@ -153,6 +153,10 @@ June 17, 2002 - March 8, 2023
   Creative Commons Attribution 4.0 International (CC BY 4.0)
   by "juskiddink"
 
+  Double Vision sound effect: "squish 4.mp3"
+  (https://freesound.org/people/nomiqbomi/sounds/578795/)
+  Creative Commons 0 license by Naomi Benham
+
   Saturate & Desaturate sounds: "can lid.wav"
   (https://freesound.org/people/Saltbearer/sounds/545742/)
   Creative Commons 0 License (CC0 1.0)
diff --git a/docs/CHANGES.txt b/docs/CHANGES.txt
index e2184d334..d4ee3a86e 100644
--- a/docs/CHANGES.txt
+++ b/docs/CHANGES.txt
@@ -62,12 +62,12 @@ https://tuxpaint.org/
       Attribution 4.0 International (CC BY 4.0)
       by https://freesound.org/people/juskiddink/)
 
-    * [WIP] "Double Vision" - separate and blend (50/50) the image,
+    * "Double Vision" - separate and blend (50/50) the image,
       simulating double vision.
       Bill Kendrick <bill@newbreedsoftware.com>
       (Closes https://sourceforge.net/p/tuxpaint/feature-requests/221/)
-      + needs icon
-      + needs sound effects
+      (Sound effect licensed as Creative Commons 0 (CC0 1.0)
+      by https://freesound.org/people/nomiqbomi/)
 
     * "Saturate" & "Desaturate" - Increase or decrease color saturation.
       Bill Kendrick <bill@newbreedsoftware.com>
diff --git a/magic/sounds/doublevision.ogg b/magic/sounds/doublevision.ogg
new file mode 100644
index 000000000..8231ca0b3
Binary files /dev/null and b/magic/sounds/doublevision.ogg differ
diff --git a/magic/src/colorsep.c b/magic/src/colorsep.c
index 9a54bc360..0d3bc726e 100644
--- a/magic/src/colorsep.c
+++ b/magic/src/colorsep.c
@@ -25,7 +25,7 @@ enum {
 static char * colorsep_snd_filenames[NUM_TOOLS] = {
   "3dglasses.ogg",
   "colorsep.ogg",
-  "colorsep.ogg" // FIXME
+  "doublevision.ogg",
 };
 
 static char * colorsep_icon_filenames[NUM_TOOLS] = {