diff --git a/src/docs/user/userguide/arcanist_new_project.diviner b/src/docs/user/userguide/arcanist_new_project.diviner
--- a/src/docs/user/userguide/arcanist_new_project.diviner
+++ b/src/docs/user/userguide/arcanist_new_project.diviner
@@ -49,10 +49,6 @@
     See below for details about path resolution, or see
     @{article:libphutil Libraries User Guide} for a general introduction to
     libphutil libraries.
-  - **project.name**: name an "Arcanist Project" to associate this working
-    copy (Git, Mercurial) or directory (SVN) with. Previously, this was a
-    required option, but `arc` can now usually operate without it in Git and
-    Mercurial. This option was previously called `project_id`.
   - **https.cabundle**: specifies the path to an alternate certificate bundle
     for use when making HTTPS connections.
   - **lint.engine**: the name of a subclass of
diff --git a/src/docs/user/userguide/arcanist_quick_start.diviner b/src/docs/user/userguide/arcanist_quick_start.diviner
--- a/src/docs/user/userguide/arcanist_quick_start.diviner
+++ b/src/docs/user/userguide/arcanist_quick_start.diviner
@@ -44,12 +44,9 @@
   yourproject/ $ $EDITOR .arcconfig
   yourproject/ $ cat .arcconfig
   {
-    "project.name" : "yourprojectname",
     "phabricator.uri" : "https://phabricator.example.com/"
   }
 
-Set `project.name` to a string that identifies the project.
-
 Set `phabricator.uri` to the URI for your Phabricator install (where `arc`
 should send changes to).
 
diff --git a/src/docs/user/userguide/libraries.diviner b/src/docs/user/userguide/libraries.diviner
--- a/src/docs/user/userguide/libraries.diviner
+++ b/src/docs/user/userguide/libraries.diviner
@@ -83,8 +83,7 @@
 `libcustom/.arcconfig`:
 
   {
-    "project.name" : "libcustom",
-    "load" : [
+    "load": [
       "phabricator/src/"
     ]
   }