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-rw-r--r--user_guide_src/source/libraries/form_validation.rst8
1 files changed, 6 insertions, 2 deletions
diff --git a/user_guide_src/source/libraries/form_validation.rst b/user_guide_src/source/libraries/form_validation.rst
index fa50c6dcf..be6d1f233 100644
--- a/user_guide_src/source/libraries/form_validation.rst
+++ b/user_guide_src/source/libraries/form_validation.rst
@@ -689,8 +689,12 @@ In this case, you can specify the array to be validated::
$this->form_validation->set_data($data);
-Creating validation rules, running the validation, and retrieving error messages works the
-same whether you are validating ``$_POST`` data or an array.
+Creating validation rules, running the validation, and retrieving error
+messages works the same whether you are validating ``$_POST`` data or
+another array of your choice.
+
+.. important:: You have to call the ``set_data()`` method *before* defining
+ any validation rules.
.. important:: If you want to validate more than one array during a single
execution, then you should call the ``reset_validation()`` method