diff --git a/includes/service.inc b/includes/service.inc
index 4455235..20e57b8 100644
--- a/includes/service.inc
+++ b/includes/service.inc
@@ -27,28 +27,6 @@ class SearchApiSolrService extends SearchApiAbstractService {
   protected $solr;
 
   /**
-   * An array of all recognized types.
-   *
-   * Maps the type names to the prefixes used for identifying them in the Solr
-   * schema.
-   *
-   * @var array
-   */
-  protected static $type_prefixes = array(
-    'text' => 'tm',
-    'tokens' => 'tm',
-    'string' => 's',
-    'integer' => 'i',
-    'decimal' => 'f',
-    'date' => 'd',
-    'duration' => 'i',
-    'boolean' => 'b',
-    'uri' => 's',
-    'location' => 'loc',
-    'geohash' => 'geo',
-  );
-
-  /**
    * Static cache for getFieldNames().
    *
    * @var array
@@ -290,7 +268,8 @@ class SearchApiSolrService extends SearchApiAbstractService {
    * Overrides SearchApiAbstractService::supportsFeature().
    */
   public function supportsFeature($feature) {
-    $supported = drupal_map_assoc(array(
+    // Search API features.
+    $supported = array(
       'search_api_autocomplete',
       'search_api_facets',
       'search_api_facets_operator_or',
@@ -300,7 +279,14 @@ class SearchApiSolrService extends SearchApiAbstractService {
       'search_api_spellcheck',
       'search_api_data_type_location',
       'search_api_data_type_geohash',
-    ));
+    );
+
+    // Custom data types.
+    foreach (search_api_solr_get_dynamic_field_info() as $type => $info) {
+      $supported[] = 'search_api_data_type_' . $type;
+    }
+
+    $supported = drupal_map_assoc($supported);
     return isset($supported[$feature]);
   }
 
@@ -495,8 +481,9 @@ class SearchApiSolrService extends SearchApiAbstractService {
         }
 
         $inner_type = search_api_extract_inner_type($type);
-        $pref = isset(self::$type_prefixes[$inner_type]) ? self::$type_prefixes[$inner_type] : '';
-        if ($pref != 'tm') {
+        $type_info = search_api_solr_get_dynamic_field_info($inner_type);
+        $pref = isset($type_info['prefix']) ? $type_info['prefix']: '';
+        if (empty($type_info['always multiValued'])) {
           $pref .= $type == $inner_type ? 's' : 'm';
         }
         if (!empty($this->options['clean_ids'])) {
diff --git a/search_api_solr.api.php b/search_api_solr.api.php
index a64c477..cc9b208 100644
--- a/search_api_solr.api.php
+++ b/search_api_solr.api.php
@@ -101,5 +101,45 @@ function hook_search_api_solr_multi_query_alter(array &$call_args, SearchApiMult
 }
 
 /**
+ * Define how Search API Solr should index different data types.
+ *
+ * It is important to make sure that any types you define are also declared to
+ * Search API using hook_search_api_data_type_info().
+ *
+ * @return array
+ *   An array containing data type definitions, keyed by their type identifier
+ *   and containing the following keys:
+ *   - prefix: The prefix used by the dynamic field type.
+ *   - always multiValued: (optional) Whether the single/multiple prefix should
+ *     be skipped for this data type. Defaults to FALSE.
+ *
+ * @see hook_search_api_solr_dynamic_field_info_alter()
+ * @see search_api_solr_get_dynamic_field_info()
+ * @see hook_search_api_data_type_info().
+ */
+function hook_search_api_solr_dynamic_field_info() {
+  return array(
+    'example_type' => array(
+      'prefix' => 'ex',
+      // Could be omitted, as FALSE is the default.
+      'always multiValued' => FALSE,
+    ),
+  );
+}
+
+/**
+ * Alter the data type indexing info.
+ *
+ * @param array $infos
+ *   The item type info array, keyed by type identifier.
+ *
+ * @see hook_search_api_solr_dynamic_field_info()
+ */
+function hook_search_api_solr_dynamic_field_info_alter(array &$infos) {
+  // Change the prefix used for example_type.
+  $info['example_type']['prefix'] = 'ex2';
+}
+
+/**
  * @} End of "addtogroup hooks".
  */
diff --git a/search_api_solr.module b/search_api_solr.module
index cfab380..52ae956 100644
--- a/search_api_solr.module
+++ b/search_api_solr.module
@@ -113,6 +113,84 @@ function search_api_solr_search_api_server_update(SearchApiServer $server) {
 }
 
 /**
+ * Returns either all dynamic field types, or a specific one.
+ *
+ * @param $type
+ *   If specified, the type whose definition should be returned.
+ *
+ * @return array
+ *   If $type was not given, an array containing all custom dynamic fields, in
+ *   the format specified by hook_search_api_solr_dynamic_field_info().
+ *   Otherwise, the definition for the given type, or NULL if it is unknown.
+ *
+ * @see hook_search_api_solr_dynamic_field_info().
+ */
+function search_api_solr_get_dynamic_field_info($type = NULL) {
+  $types = &drupal_static(__FUNCTION__);
+  if (!isset($types)) {
+    $types = module_invoke_all('search_api_solr_dynamic_field_info');
+    $types = $types ? $types : array();
+    drupal_alter('search_api_solr_dynamic_field_info', $types);
+  }
+  if (isset($type)) {
+    return isset($types[$type]) ? $types[$type] : NULL;
+  }
+  return $types;
+}
+
+/**
+ * Implements hook_search_api_solr_dynamic_field_info().
+ */
+function search_api_solr_search_api_solr_dynamic_field_info() {
+  return array(
+    'text' => array(
+      'prefix' => 'tm',
+      'always multiValued' => TRUE,
+    ),
+    'tokens' => array(
+      'prefix' => 'tm',
+      'always multiValued' => TRUE,
+    ),
+    'string' => array(
+      'prefix' => 's',
+      'always multiValued' => FALSE,
+    ),
+    'integer' => array(
+      'prefix' => 'i',
+      'always multiValued' => FALSE,
+    ),
+    'decimal' => array(
+      'prefix' => 'f',
+      'always multiValued' => FALSE,
+    ),
+    'date' => array(
+      'prefix' => 'd',
+      'always multiValued' => FALSE,
+    ),
+    'duration' => array(
+      'prefix' => 'i',
+      'always multiValued' => FALSE,
+    ),
+    'boolean' => array(
+      'prefix' => 'b',
+      'always multiValued' => FALSE,
+    ),
+    'uri' => array(
+      'prefix' => 's',
+      'always multiValued' => FALSE,
+    ),
+    'location' => array(
+      'prefix' => 'loc',
+      'always multiValued' => FALSE,
+    ),
+    'geohash' => array(
+      'prefix' => 'geohash',
+      'always multiValued' => FALSE,
+    ),
+  );
+}
+
+/**
  * Retrieves a list of all config files of a server.
  *
  * @param SearchApiServer $server