diff --git a/source/reference/operator/query/mod.txt b/source/reference/operator/query/mod.txt
index 85ece0f04c7..b3a141c891c 100644
--- a/source/reference/operator/query/mod.txt
+++ b/source/reference/operator/query/mod.txt
@@ -117,3 +117,31 @@ operator with an array that contains four elements:
    	"$err" : "bad query: BadValue malformed mod, too many elements",
    	"code" : 16810
    }
+
+Modulo with Decimal Divisors
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The ``modulo`` expression rounds down decimal input to the floor.
+
+The following examples demonstrates this behavior :
+   
+.. code-block:: javascript
+
+   db.inventory.find( { qty: { $mod: [ 4.0, 0 ] } } )
+
+   { _id: 1, item: 'abc123', qty: 0 }
+   { _id: 3, item: 'ijk123', qty: 12 }
+
+   db.inventory.find( { qty: { $mod: [ 4.5, 0 ] } } )
+
+   { _id: 1, item: 'abc123', qty: 0 }
+   { _id: 3, item: 'ijk123', qty: 12 }
+
+   db.inventory.find( { qty: { $mod: [ 4.99, 0 ] } } )
+   
+   { _id: 1, item: 'abc123', qty: 0 }
+   { _id: 3, item: 'ijk123', qty: 12 }
+
+Each query applies 4 to the mod function regardless of decimal points 
+resulting in the same result set.
+