diff --git a/app/(core)/data/configs/BallGravity.js b/app/(core)/data/configs/BallGravity.js
index 2dea291e..ff2e1fc0 100644
--- a/app/(core)/data/configs/BallGravity.js
+++ b/app/(core)/data/configs/BallGravity.js
@@ -57,7 +57,7 @@ export const INPUT_FIELDS = [
   },
   {
     name: "restitution",
-    label: "ζ - Damping:",
+    label: "e - Coefficient of restitution (0–1):",
     type: "number",
     min: 0,
     max: 1,
diff --git a/app/(core)/data/configs/BouncingBall.js b/app/(core)/data/configs/BouncingBall.js
index eb97c4e9..02ac7101 100644
--- a/app/(core)/data/configs/BouncingBall.js
+++ b/app/(core)/data/configs/BouncingBall.js
@@ -34,7 +34,7 @@ export const INPUT_FIELDS = [
   },
   {
     name: "restitution",
-    label: "ζ - Damping:",
+    label: "e - Coefficient of restitution (0–1):",
     type: "number",
     min: 0,
     max: 2,