diff --git a/README.md b/README.md
index 563a791..78b68fb 100644
--- a/README.md
+++ b/README.md
@@ -33,8 +33,8 @@ range of 0 - 1; if `amount` is outside of this range it is clamped.
 Similar to `lume.lerp()` but uses cosine interpolation instead of linear
 interpolation.
 
-### lume.pingpong(x, len)
-Ping-pongs the value `x` between 0 and `len`.
+### lume.pingpong(x)
+Ping-pongs the value `x` between 0 and 1.
 
 ### lume.distance(x1, y1, x2, y2)
 Returns the distance between the two points.
diff --git a/lume.lua b/lume.lua
index eaa4ed5..9e35d43 100644
--- a/lume.lua
+++ b/lume.lua
@@ -7,7 +7,7 @@
 -- under the terms of the MIT license. See LICENSE for details.
 --
 
-local lume = { _version = "1.0.1" }
+local lume = { _version = "1.0.2" }
 
 
 function lume.clamp(x, min, max)
@@ -36,8 +36,8 @@ function lume.smooth(a, b, amount)
 end
 
 
-function lume.pingpong(x, len)
-  return (1 - math.abs(1 - x % 2)) * (len or 1)
+function lume.pingpong(x)
+  return 1 - math.abs(1 - x % 2)
 end