diff --git a/lib/chai/core/assertions.js b/lib/chai/core/assertions.js
index 8af77e280..2468e4a00 100644
--- a/lib/chai/core/assertions.js
+++ b/lib/chai/core/assertions.js
@@ -1959,7 +1959,7 @@ module.exports = function (chai, _) {
   Assertion.addChainableMethod('changes', assertChanges);
 
   /**
-   * ### .increase(function)
+   * ### .increase(target, property)
    *
    * Asserts that a function increases a numeric object property
    *
@@ -2016,7 +2016,7 @@ module.exports = function (chai, _) {
   Assertion.addChainableMethod('increases', assertIncreases);
 
   /**
-   * ### .decrease(function)
+   * ### .decrease(target, property)
    *
    * Asserts that a function decreases a numeric object property
    *