diff --git a/release/includes/project_release_node_type.inc b/release/includes/project_release_node_type.inc
index db4aeff..e2a4456 100644
--- a/release/includes/project_release_node_type.inc
+++ b/release/includes/project_release_node_type.inc
@@ -875,6 +875,52 @@ function _project_release_create_release_node_type() {
     'bundle' => 'field_release_files',
   ));
 
+  // A GPG signature of the release file.
+  field_create_field(array(
+    'translatable' => '0',
+    'settings' => array(
+      'display_field' => 0,
+      'display_default' => 1,
+      'uri_scheme' => 'public',
+    ),
+    'field_name' => 'field_release_file_signature',
+    'type' => 'file',
+    'active' => '1',
+    'locked' => '0',
+    'cardinality' => '1',
+  ));
+  field_create_instance(array(
+    'label' => $t('Release file signature'),
+    'widget' => array(
+      'weight' => '1',
+      'type' => 'file_generic',
+      'active' => 1,
+      'settings' => array(
+        'progress_indicator' => 'throbber',
+      ),
+    ),
+    'settings' => array(
+      'file_directory' => 'project',
+      'file_extensions' => 'asc',
+      'max_filesize' => '',
+      'description_field' => 0,
+      'user_register_form' => FALSE,
+    ),
+    'display' => array(
+      'default' => array(
+        'label' => 'above',
+        'type' => 'file_default',
+        'weight' => '0',
+        'settings' => array(),
+      ),
+    ),
+    'required' => 0,
+    'description' => '',
+    'field_name' => 'field_release_file_signature',
+    'entity_type' => 'field_collection_item',
+    'bundle' => 'field_release_files',
+  ));
+
   // Number of times this file has been downloaded. This value is updated by
   // site specific means.
   field_create_field(array(
diff --git a/release/project_release.install b/release/project_release.install
index b01d26a..6b430de 100644
--- a/release/project_release.install
+++ b/release/project_release.install
@@ -2053,3 +2053,55 @@ function project_release_update_7021() {
   }
   field_cache_clear();
 }
+
+/**
+ * Add a signature field for the release file.
+ */
+function project_release_update_7022() {
+  $t = get_t();
+  field_create_field(array(
+    'translatable' => '0',
+    'settings' => array(
+      'display_field' => 0,
+      'display_default' => 1,
+      'uri_scheme' => 'public',
+    ),
+    'field_name' => 'field_release_file_signature',
+    'type' => 'file',
+    'active' => '1',
+    'locked' => '0',
+    'cardinality' => '1',
+  ));
+  field_create_instance(array(
+    'label' => $t('Release file signature'),
+    'widget' => array(
+      'weight' => '1',
+      'type' => 'file_generic',
+      'active' => 1,
+      'settings' => array(
+        'progress_indicator' => 'throbber',
+      ),
+    ),
+    'settings' => array(
+      'file_directory' => 'project',
+      'file_extensions' => 'asc',
+      'max_filesize' => '',
+      'description_field' => 0,
+      'user_register_form' => FALSE,
+    ),
+    'display' => array(
+      'default' => array(
+        'label' => 'above',
+        'type' => 'file_default',
+        'weight' => '0',
+        'settings' => array(),
+      ),
+    ),
+    'required' => 0,
+    'description' => '',
+    'field_name' => 'field_release_file_signature',
+    'entity_type' => 'field_collection_item',
+    'bundle' => 'field_release_files',
+  ));
+  field_cache_clear();
+}