diff --git a/src/applications/project/controller/PhabricatorProjectMembersAddController.php b/src/applications/project/controller/PhabricatorProjectMembersAddController.php
--- a/src/applications/project/controller/PhabricatorProjectMembersAddController.php
+++ b/src/applications/project/controller/PhabricatorProjectMembersAddController.php
@@ -27,9 +27,14 @@
       $copy = pht('Parent projects and milestones do not support adding '.
         'members. You can add members directly to any non-parent subproject.');
 
+      $subprojects_uri = "/project/subprojects/{$id}/";
+
       return $this->newDialog()
         ->setTitle(pht('Unsupported Project'))
         ->appendParagraph($copy)
+        ->setSubmitURI($subprojects_uri)
+        ->addSubmitButton(pht('See Subprojects'))
+        ->setDisableWorkflowOnSubmit(true)
         ->addCancelButton($done_uri);
     }
 
diff --git a/src/applications/project/controller/PhabricatorProjectUpdateController.php b/src/applications/project/controller/PhabricatorProjectUpdateController.php
--- a/src/applications/project/controller/PhabricatorProjectUpdateController.php
+++ b/src/applications/project/controller/PhabricatorProjectUpdateController.php
@@ -38,9 +38,14 @@
       $copy = pht('Parent projects and milestones do not support adding '.
         'members. You can add members directly to any non-parent subproject.');
 
+      $subprojects_uri = "/project/subprojects/{$id}/";
+
       return $this->newDialog()
         ->setTitle(pht('Unsupported Project'))
         ->appendParagraph($copy)
+        ->setSubmitURI($subprojects_uri)
+        ->addSubmitButton(pht('See Subprojects'))
+        ->setDisableWorkflowOnSubmit(true)
         ->addCancelButton($done_uri);
     }
 
diff --git a/src/view/AphrontDialogView.php b/src/view/AphrontDialogView.php
--- a/src/view/AphrontDialogView.php
+++ b/src/view/AphrontDialogView.php
@@ -51,6 +51,15 @@
     return $this->isStandalone;
   }
 
+  /**
+   * Set the URI associated to the Submit Button
+   *
+   * If you want a normal link and not any form submission,
+   * see also: setDisableWorkflowOnSubmit(false).
+   *
+   * @param string $uri
+   * @return self
+   */
   public function setSubmitURI($uri) {
     $this->submitURI = $uri;
     return $this;
@@ -92,6 +101,15 @@
     return $this->resizeX;
   }
 
+  /**
+   * Add a Submit Button and specify its text
+   *
+   * If you want to associate an URI for this Button,
+   * see also: setSubmitURI().
+   *
+   * @param string $text Text shown for that button
+   * @return self
+   */
   public function addSubmitButton($text = null) {
     if (!$text) {
       $text = pht('Okay');
@@ -228,6 +246,14 @@
     return $this->appendChild($form->buildLayoutView());
   }
 
+  /**
+   * Enable or Disable a Workflow on Submit
+   *
+   * For example, if your Submit Button should be a normal link,
+   * without activating any Workflow, you can set false.
+   * @param bool $disable_workflow_on_submit
+   * @return self
+   */
   public function setDisableWorkflowOnSubmit($disable_workflow_on_submit) {
     $this->disableWorkflowOnSubmit = $disable_workflow_on_submit;
     return $this;