diff --git a/resources/sql/patches/20131121.passphraseedge.sql b/resources/sql/patches/20131121.passphraseedge.sql
new file mode 100644
index 0000000000..38cfdb0453
--- /dev/null
+++ b/resources/sql/patches/20131121.passphraseedge.sql
@@ -0,0 +1,15 @@
+CREATE TABLE {$NAMESPACE}_passphrase.edge (
+  src VARCHAR(64) NOT NULL COLLATE utf8_bin,
+  type VARCHAR(64) NOT NULL COLLATE utf8_bin,
+  dst VARCHAR(64) NOT NULL COLLATE utf8_bin,
+  dateCreated INT UNSIGNED NOT NULL,
+  seq INT UNSIGNED NOT NULL,
+  dataID INT UNSIGNED,
+  PRIMARY KEY (src, type, dst),
+  KEY (src, type, dateCreated, seq)
+) ENGINE=InnoDB, COLLATE utf8_general_ci;
+
+CREATE TABLE {$NAMESPACE}_passphrase.edgedata (
+  id INT UNSIGNED NOT NULL PRIMARY KEY AUTO_INCREMENT,
+  data LONGTEXT NOT NULL COLLATE utf8_bin
+) ENGINE=InnoDB, COLLATE utf8_general_ci;
diff --git a/src/applications/passphrase/controller/PassphraseCredentialViewController.php b/src/applications/passphrase/controller/PassphraseCredentialViewController.php
index 3a4e9d6b9b..9499bbc553 100644
--- a/src/applications/passphrase/controller/PassphraseCredentialViewController.php
+++ b/src/applications/passphrase/controller/PassphraseCredentialViewController.php
@@ -151,6 +151,17 @@ final class PassphraseCredentialViewController extends PassphraseController {
       pht('Username'),
       $credential->getUsername());
 
+    $used_by_phids = PhabricatorEdgeQuery::loadDestinationPHIDs(
+      $credential->getPHID(),
+      PhabricatorEdgeConfig::TYPE_CREDENTIAL_USED_BY_OBJECT);
+
+    if ($used_by_phids) {
+      $this->loadHandles($used_by_phids);
+      $properties->addProperty(
+        pht('Used By'),
+        $this->renderHandlesForPHIDs($used_by_phids));
+    }
+
     $description = $credential->getDescription();
     if (strlen($description)) {
       $properties->addSectionHeader(
diff --git a/src/applications/passphrase/storage/PassphraseCredential.php b/src/applications/passphrase/storage/PassphraseCredential.php
index 6339174d9a..880bf5f170 100644
--- a/src/applications/passphrase/storage/PassphraseCredential.php
+++ b/src/applications/passphrase/storage/PassphraseCredential.php
@@ -19,6 +19,7 @@ final class PassphraseCredential extends PassphraseDAO
     return id(new PassphraseCredential())
       ->setName('')
       ->setUsername('')
+      ->setDescription('')
       ->setIsDestroyed(0)
       ->setViewPolicy($actor->getPHID())
       ->setEditPolicy($actor->getPHID());
diff --git a/src/infrastructure/edges/constants/PhabricatorEdgeConfig.php b/src/infrastructure/edges/constants/PhabricatorEdgeConfig.php
index 6929837304..16b33f373c 100644
--- a/src/infrastructure/edges/constants/PhabricatorEdgeConfig.php
+++ b/src/infrastructure/edges/constants/PhabricatorEdgeConfig.php
@@ -60,6 +60,9 @@ final class PhabricatorEdgeConfig extends PhabricatorEdgeConstants {
   const TYPE_MOCK_HAS_TASK              = 37;
   const TYPE_TASK_HAS_MOCK              = 38;
 
+  const TYPE_OBJECT_USES_CREDENTIAL     = 39;
+  const TYPE_CREDENTIAL_USED_BY_OBJECT  = 40;
+
   const TYPE_TEST_NO_CYCLE              = 9000;
 
   const TYPE_PHOB_HAS_ASANATASK         = 80001;
@@ -71,6 +74,7 @@ final class PhabricatorEdgeConfig extends PhabricatorEdgeConstants {
   const TYPE_PHOB_HAS_JIRAISSUE         = 80004;
   const TYPE_JIRAISSUE_HAS_PHOB         = 80005;
 
+
   public static function getInverse($edge_type) {
     static $map = array(
       self::TYPE_TASK_HAS_COMMIT => self::TYPE_COMMIT_HAS_TASK,
@@ -134,7 +138,10 @@ final class PhabricatorEdgeConfig extends PhabricatorEdgeConstants {
       self::TYPE_REVIEWER_FOR_DREV => self::TYPE_DREV_HAS_REVIEWER,
 
       self::TYPE_PHOB_HAS_JIRAISSUE => self::TYPE_JIRAISSUE_HAS_PHOB,
-      self:: TYPE_JIRAISSUE_HAS_PHOB => self::TYPE_PHOB_HAS_JIRAISSUE
+      self::TYPE_JIRAISSUE_HAS_PHOB => self::TYPE_PHOB_HAS_JIRAISSUE,
+
+      self::TYPE_OBJECT_USES_CREDENTIAL => self::TYPE_CREDENTIAL_USED_BY_OBJECT,
+      self::TYPE_CREDENTIAL_USED_BY_OBJECT => self::TYPE_OBJECT_USES_CREDENTIAL,
     );
 
     return idx($map, $edge_type);
diff --git a/src/infrastructure/storage/patch/PhabricatorBuiltinPatchList.php b/src/infrastructure/storage/patch/PhabricatorBuiltinPatchList.php
index a8cdf2bc53..253633fddc 100644
--- a/src/infrastructure/storage/patch/PhabricatorBuiltinPatchList.php
+++ b/src/infrastructure/storage/patch/PhabricatorBuiltinPatchList.php
@@ -1772,6 +1772,10 @@ final class PhabricatorBuiltinPatchList extends PhabricatorSQLPatchList {
         'type' => 'sql',
         'name' => $this->getPatchPath('20131120.nuancesourcetype.sql'),
       ),
+      '20131121.passphraseedge.sql' => array(
+        'type' => 'sql',
+        'name' => $this->getPatchPath('20131121.passphraseedge.sql'),
+      ),
     );
   }
 }