diff --git a/macrovision.js b/macrovision.js
index 0f7e3154..a9536ff0 100644
--- a/macrovision.js
+++ b/macrovision.js
@@ -461,6 +461,11 @@ math.createUnit("hands", {
     aliases: ["hand", "hands"]
 });
 
+math.createUnit("acreFeet", {
+    definition: "1 acre * foot",
+    prefixes: "long",
+});
+
 //#endregion
 
 const defaultUnits = {
@@ -570,7 +575,7 @@ const unitChoices = {
     },
     volume: {
         metric: ["milliliters", "liters", "m^3"],
-        customary: ["in^3", "floz", "teaspoons", "tablespoons", "cups", "pints", "quarts", "gallons"],
+        customary: ["in^3", "floz", "teaspoons", "tablespoons", "cups", "pints", "quarts", "gallons", "acreFeet"],
         relative: [
             "oilbarrels",
             "shippingContainers",