diff --git a/postcss/css-compile-variables.js b/postcss/css-compile-variables.js
index 4adfc7b1..023c8eb7 100644
--- a/postcss/css-compile-variables.js
+++ b/postcss/css-compile-variables.js
@@ -87,7 +87,7 @@ function addResolvedVariablesToRootSelector(root, variables, {Rule, Declaration}
 /**
  * 
  * @param {Object} opts - Options for the plugin
- * @param {Object} opts.variables - An object with of the form: {base_variable_name_1: value, base_variable_name_2: value, ...}
+ * @param {Object} opts.variables - An object of the form: {base_variable_name_1: value, base_variable_name_2: value, ...}
  * @param {derive} opts.derive - The callback which contains the logic for resolving derived variables
  */
 module.exports = (opts = {}) => {