Add is_dirty method to check whether a field has modified

1 files changed, 6 insertions, 0 deletions

diff --git a/README.markdown b/README.markdown
index b6ef1a6..9a93ffa 100644
--- a/README.markdown
+++ b/README.markdown
@@ -313,6 +313,12 @@ To add a new record, you need to first create an "empty" object instance. You th
 
 After the object has been saved, you can call its `id()` method to find the autogenerated primary key value that the database assigned to it.
 
+### Checking whether a property has been modified ###
+
+To check whether a property has been changed since the object was created (or last saved), call the `is_dirty` method:
+
+    $name_has_changed = $person->is_dirty('name'); // Returns true or false
+
 ### Deleting records ###
 
 To delete an object from the database, simply call its `delete` method.