diff --git a/docs/pages/Calculation-Configuration.md b/docs/pages/Calculation-Configuration.md
index 74a5c5f4b9fbb64530f6b46e393c64af92d14def..097e8d5920e0c6c435c45b261826c3fcde7822b4 100644
--- a/docs/pages/Calculation-Configuration.md
+++ b/docs/pages/Calculation-Configuration.md
@@ -28,7 +28,7 @@ __`gmm`__
    `.sigmaScale`            |`Double`   | `1.0` (100%, no scaling)   | Limited to range [0.5..1.0] 50% to 100%
    `.vertical`              |`Boolean`  | `false`                    | Compute vertical ground motions
 __`disagg`__
-   `.retrunPeriod`          |`Double`   | `2475`                     |
+   `.returnPeriod`          |`Double`   | `2475`                     |
    `.bins`                  |`Object`   |                            | [4](#notes)
    `.contributorLimit`      |`Double`   | `0.1`                      | [5](#notes)
 __`rate`__