diff --git a/docs/api-operation.md b/docs/api-operation.md
index 6efae330..711048a9 100644
--- a/docs/api-operation.md
+++ b/docs/api-operation.md
@@ -263,7 +263,7 @@ Returns **Sharp**
 
 ## threshold
 
-Any pixel value greather than or equal to the threshold value will be set to 255, otherwise it will be set to 0.
+Any pixel value greater than or equal to the threshold value will be set to 255, otherwise it will be set to 0.
 
 ### Parameters
 
diff --git a/lib/operation.js b/lib/operation.js
index 61485cd4..46c21986 100644
--- a/lib/operation.js
+++ b/lib/operation.js
@@ -396,7 +396,7 @@ function convolve (kernel) {
 }
 
 /**
- * Any pixel value greather than or equal to the threshold value will be set to 255, otherwise it will be set to 0.
+ * Any pixel value greater than or equal to the threshold value will be set to 255, otherwise it will be set to 0.
  * @param {number} [threshold=128] - a value in the range 0-255 representing the level at which the threshold will be applied.
  * @param {Object} [options]
  * @param {Boolean} [options.greyscale=true] - convert to single channel greyscale.