diff --git a/src/applications/conduit/method/conduit/connect/ConduitAPI_conduit_connect_Method.php b/src/applications/conduit/method/conduit/connect/ConduitAPI_conduit_connect_Method.php
index 3d2a7ff9a4..dfa88b2273 100644
--- a/src/applications/conduit/method/conduit/connect/ConduitAPI_conduit_connect_Method.php
+++ b/src/applications/conduit/method/conduit/connect/ConduitAPI_conduit_connect_Method.php
@@ -86,7 +86,7 @@ final class ConduitAPI_conduit_connect_Method extends ConduitAPIMethod {
 
     switch ($client) {
       case 'arc':
-        $server_version = 3;
+        $server_version = 4;
         switch ($client_version) {
           case $server_version:
             break;
diff --git a/src/applications/differential/field/specification/base/DifferentialFieldSpecification.php b/src/applications/differential/field/specification/base/DifferentialFieldSpecification.php
index 7237c9b1e3..9d47c9c57d 100644
--- a/src/applications/differential/field/specification/base/DifferentialFieldSpecification.php
+++ b/src/applications/differential/field/specification/base/DifferentialFieldSpecification.php
@@ -431,6 +431,8 @@ abstract class DifferentialFieldSpecification {
    * message, return true. If the authoritative value should always be used,
    * return false. By default, fields can not be overwritten.
    *
+   * arc will only attempt to overwrite field values if run with "--verbatim".
+   *
    * @return bool True to indicate the field is save to overwrite.
    * @task commit
    */
diff --git a/src/applications/differential/field/specification/revisionid/DifferentialRevisionIDFieldSpecification.php b/src/applications/differential/field/specification/revisionid/DifferentialRevisionIDFieldSpecification.php
index 9d451b1252..96e8c956ce 100644
--- a/src/applications/differential/field/specification/revisionid/DifferentialRevisionIDFieldSpecification.php
+++ b/src/applications/differential/field/specification/revisionid/DifferentialRevisionIDFieldSpecification.php
@@ -47,7 +47,7 @@ final class DifferentialRevisionIDFieldSpecification
   }
 
   public function renderValueForCommitMessage($is_edit) {
-    if ($is_edit || !$this->id) {
+    if (!$this->id) {
       return null;
     }
     return PhabricatorEnv::getProductionURI('/D'.$this->id);