diff --git a/docs/parameterData.json b/docs/parameterData.json
index 494f63f022..a7fba5bd7b 100644
--- a/docs/parameterData.json
+++ b/docs/parameterData.json
@@ -1485,11 +1485,14 @@
     "noiseDetail": {
       "overloads": [
         [
-          "Number",
+          "Number"
+        ],
+        [
+          "Number", 
           "Number"
         ]
-      ]
-    },
+  ]
+},
     "noiseSeed": {
       "overloads": [
         [
diff --git a/src/math/noise.js b/src/math/noise.js
index c5fa491730..3a9ee50cc8 100644
--- a/src/math/noise.js
+++ b/src/math/noise.js
@@ -343,7 +343,7 @@ function noise(p5, fn){
    *
    * @method noiseDetail
    * @param {Number} lod number of octaves to be used by the noise.
-   * @param {Number} falloff falloff factor for each octave.
+   * @param {Number} [falloff=0.5] falloff factor for each octave.
    *
    * @example
    * <div>
@@ -388,7 +388,7 @@ function noise(p5, fn){
    * </code>
    * </div>
    */
-  fn.noiseDetail = function(lod, falloff) {
+  fn.noiseDetail = function(lod, falloff=0.5) {
     if (lod > 0) {
       perlin_octaves = lod;
     }