diff --git a/includes/derivatives.inc b/includes/derivatives.inc
index ccd8c0d3..9b44b9af 100644
--- a/includes/derivatives.inc
+++ b/includes/derivatives.inc
@@ -62,6 +62,9 @@ function islandora_run_derivatives(AbstractObject $object, $dsid) {
  *     from or NULL if it's the object itself.
  *   - destination_dsid: (Optional) String of the datastream id that is being
  *     created. To be used in the UI.
+ *   - ds_modified_params: (Optional, typically internally used) The array of
+ *     parameters originally sent to FedoraDatastream::modifyDatastream(). Used
+ *     to refine the derivative list; typically should't be passed in manually.
  *
  * @return array
  *   An array of messages describing the outcome of the derivative events.
@@ -287,6 +290,7 @@ function islandora_remove_defer_derivatives_flag(AbstractObject $object) {
 function islandora_get_derivative_list(AbstractObject $object, &$options) {
   module_load_include('inc', 'islandora', 'includes/utilities');
 
+  $ds_modified_params = isset($options['ds_modified_params']) ? $options['ds_modified_params'] : array();
   $options += array(
     'force' => FALSE,
   );
@@ -294,11 +298,12 @@ function islandora_get_derivative_list(AbstractObject $object, &$options) {
   $derivatives = islandora_invoke_hook_list(
     ISLANDORA_DERIVATIVE_CREATION_HOOK,
     $object->models,
-    array($object)
+    array($object),
+    $ds_modified_params
   );
 
   foreach (islandora_build_hook_list(ISLANDORA_DERIVATIVE_CREATION_HOOK, $object->models) as $hook) {
-    drupal_alter($hook, $derivatives, $object);
+    drupal_alter($hook, $derivatives, $object, $ds_modified_params);
   }
 
   uasort($derivatives, 'drupal_sort_weight');
diff --git a/includes/tuque_wrapper.inc b/includes/tuque_wrapper.inc
index 6a38ad4a..7d1d348d 100644
--- a/includes/tuque_wrapper.inc
+++ b/includes/tuque_wrapper.inc
@@ -594,7 +594,7 @@ class IslandoraFedoraDatastream extends FedoraDatastream {
   protected function modifyDatastream(array $args) {
     try {
       parent::modifyDatastream($args);
-      islandora_invoke_datastream_hooks(ISLANDORA_DATASTREAM_MODIFIED_HOOK, $this->parent->models, $this->id, $this->parent, $this);
+      islandora_invoke_datastream_hooks(ISLANDORA_DATASTREAM_MODIFIED_HOOK, $this->parent->models, $this->id, $this->parent, $this, $args);
       if ($this->state == 'D') {
         islandora_invoke_datastream_hooks(ISLANDORA_DATASTREAM_PURGED_HOOK, $this->parent->models, $this->id, $this->parent, $this->id);
       }
diff --git a/islandora.api.php b/islandora.api.php
index 1d0d9872..31c6a6d5 100644
--- a/islandora.api.php
+++ b/islandora.api.php
@@ -334,12 +334,12 @@ function hook_cmodel_pid_dsid_islandora_datastream_ingested(AbstractObject $obje
  * @param AbstractObject $object
  *   The object the datastream belongs to.
  * @param AbstractDatastream $datastream
- *   The datastream that was ingested.
- *
- * @todo We should also include what changes were made in a additional
- *   parameter.
+ *   The datastream that was modified.
+ * @param array $params
+ *   The parameters from FedoraDatastream::modifyDatastream() used to modify the
+ *   datastream.
  */
-function hook_islandora_datastream_modified(AbstractObject $object, AbstractDatastream $datastream) {
+function hook_islandora_datastream_modified(AbstractObject $object, AbstractDatastream $datastream, array $params) {
 
 }
 
@@ -348,7 +348,7 @@ function hook_islandora_datastream_modified(AbstractObject $object, AbstractData
  *
  * @see hook_islandora_datastream_modified()
  */
-function hook_cmodel_pid_islandora_datastream_modified(AbstractObject $object, AbstractDatastream $datastream) {
+function hook_cmodel_pid_islandora_datastream_modified(AbstractObject $object, AbstractDatastream $datastream, array $params) {
 
 }
 
@@ -660,6 +660,10 @@ function hook_cmodel_pid_islandora_overview_object_alter(AbstractObject &$object
  *
  * @param AbstractObject $object
  *   Optional object to which derivatives will be added
+ * @param array $ds_modified_params
+ *   An array that will contain the properties changed on the datastream if
+ *   derivatives were triggered from a datastream_modified hook. Can be
+ *   populated manually, but likely empty otherwise.
  *
  * @return array
  *   An array containing an entry for each derivative to be created. Each entry
@@ -693,7 +697,7 @@ function hook_cmodel_pid_islandora_overview_object_alter(AbstractObject &$object
  *   - file: A string denoting the path to the file where the function
  *     is being called from.
  */
-function hook_islandora_derivative(AbstractObject $object = NULL) {
+function hook_islandora_derivative(AbstractObject $object = NULL, $ds_modified_params = array()) {
   $derivatives[] = array(
     'source_dsid' => 'OBJ',
     'destination_dsid' => 'DERIV',
@@ -736,7 +740,7 @@ function hook_cmodel_pid_islandora_derivative() {
 /**
  * Allows for the altering of defined derivative functions.
  */
-function hook_islandora_derivative_alter(&$derivatives, AbstractObject $object) {
+function hook_islandora_derivative_alter(&$derivatives, AbstractObject $object, $ds_modified_params = array()) {
   foreach ($derivatives as $key => $derivative) {
     if ($derivative['destination_dsid'] == 'TN') {
       unset($derivatives[$key]);
diff --git a/islandora.module b/islandora.module
index b3c4263c..670b2b66 100644
--- a/islandora.module
+++ b/islandora.module
@@ -1798,11 +1798,12 @@ function islandora_islandora_datastream_ingested(AbstractObject $object, Abstrac
  * equal to the current ingested datastream's id. Force is set to TRUE such that
  * existing derivatives will be updated to reflect the change in the source.
  */
-function islandora_islandora_datastream_modified(AbstractObject $object, AbstractDatastream $datastream) {
+function islandora_islandora_datastream_modified(AbstractObject $object, AbstractDatastream $datastream, $params) {
   module_load_include('inc', 'islandora', 'includes/derivatives');
   $logging_results = islandora_do_derivatives($object, array(
     'source_dsid' => $datastream->id,
     'force' => TRUE,
+    'ds_modified_params' => $params,
   ));
   islandora_derivative_logging($logging_results);
   islandora_conditionally_clear_cache();