diff --git a/docs/images/tasks-metadata-indexers.uml b/docs/images/tasks-metadata-indexers.uml
--- a/docs/images/tasks-metadata-indexers.uml
+++ b/docs/images/tasks-metadata-indexers.uml
@@ -1,11 +1,10 @@
 @startuml
   participant LOADERS as "Loaders"
   participant JOURNAL as "Journal"
-  participant SCHEDULER as "Scheduler"
+  participant IDX_ORIG_META as "Origin Metadata Indexer"
   participant IDX_ORIG_HEAD as "Origin-Head Indexer"
-  participant IDX_REV_META as "Revision Metadata Indexer"
+  participant IDX_DIR_META as "Directory Metadata Indexer"
   participant IDX_CONT_META as "Content Metadata Indexer"
-  participant IDX_ORIG_META as "Origin Metadata Indexer"
   participant IDX_STORAGE as "Indexer Storage"
   participant STORAGE as "Graph Storage"
   participant OBJ_STORAGE as "Object Storage"
@@ -14,41 +13,41 @@
   activate IDX_STORAGE
   activate STORAGE
   activate JOURNAL
-  activate SCHEDULER
+  activate IDX_ORIG_META
 
   activate LOADERS
 
-  LOADERS->>JOURNAL: Origin 42 was added/revisited
+  LOADERS->>JOURNAL: Origin http://example.org/repo.git\nwas added/revisited
   deactivate LOADERS
 
-  JOURNAL->>SCHEDULER: run indexers on origin 42
+  JOURNAL->>IDX_ORIG_META: run indexers on origin\nhttp://example.org/repo.git
 
-  SCHEDULER->>IDX_ORIG_HEAD: Find HEAD revision of 42
+  IDX_ORIG_META->>IDX_ORIG_HEAD: Find HEAD revision of\nhttp://example.org/repo.git
   activate IDX_ORIG_HEAD
 
-  IDX_ORIG_HEAD->>STORAGE: snapshot_get_latest(origin=42)
+  IDX_ORIG_HEAD->>STORAGE: snapshot_get_latest(origin="http://example.org/repo.git")
 
   STORAGE->>IDX_ORIG_HEAD: branches
 
-  IDX_ORIG_HEAD->>SCHEDULER: run Revision Metadata Indexer\non revision 42abcdef\n(head of origin 42)
+  IDX_ORIG_HEAD->>IDX_ORIG_META: run Revision Metadata Indexer\non revision 42abcdef (head of origin\nhttp://example.org/repo.git)
   deactivate IDX_ORIG_HEAD
 
-  SCHEDULER->>IDX_REV_META: Index revision 42abcdef\n(head of origin 42)
-  activate IDX_REV_META
+  IDX_ORIG_META->>STORAGE: revision_get(sha1=42abcdef)
+  STORAGE->>IDX_ORIG_META: {id: 42abcdef, message: "Commit message", directory: 456789ab, ...}
 
-  IDX_REV_META->>STORAGE: revision_get(sha1=42abcdef)
-  STORAGE->>IDX_REV_META: {id: 42abcdef, message: "Commit message", directory: 456789ab, ...}
+  IDX_ORIG_META->>IDX_DIR_META: Index directory 456789ab\n(head of origin http://example.org/repo.git)
+  activate IDX_DIR_META
 
-  IDX_REV_META->>STORAGE: directory_ls(sha1=456789ab)
-  STORAGE->>IDX_REV_META: [{id: 1234cafe, name: "package.json", type: file, ...}, {id: cafe4321, name: "README", type: file, ...}, ...]
+  IDX_DIR_META->>STORAGE: directory_ls(sha1=456789ab)
+  STORAGE->>IDX_DIR_META: [{id: 1234cafe, name: "package.json", type: file, ...}, {id: cafe4321, name: "README", type: file, ...}, ...]
 
-  IDX_REV_META->>IDX_REV_META: package.json is a metadata file
+  IDX_DIR_META->>IDX_DIR_META: package.json is a metadata file
 
-  IDX_REV_META->>IDX_STORAGE: content_metadata_get(sha1=1234cafe)
-  IDX_STORAGE->>IDX_REV_META: none / {author: "Jane Doe", ...}
+  IDX_DIR_META->>IDX_STORAGE: content_metadata_get(sha1=1234cafe)
+  IDX_STORAGE->>IDX_DIR_META: none / {author: "Jane Doe", ...}
 
   alt If the storage answered "none"
-    IDX_REV_META->>IDX_CONT_META: Index file 1234cafe as an NPM metadata file
+    IDX_DIR_META->>IDX_CONT_META: Index file 1234cafe as an NPM metadata file
     activate IDX_CONT_META
 
     IDX_CONT_META->>OBJ_STORAGE: content_get 1234cafe
@@ -60,23 +59,17 @@
     IDX_CONT_META->>IDX_STORAGE: content_metadata_add(sha1=1234cafe, {author: "Jane Doe", ...})
     IDX_STORAGE->>IDX_CONT_META: ok
 
-    IDX_CONT_META->>IDX_REV_META: extracted: {author: "Jane Doe", ...}
+    IDX_CONT_META->>IDX_DIR_META: extracted: {author: "Jane Doe", ...}
     deactivate IDX_CONT_META
-  end
 
-  IDX_REV_META->>IDX_STORAGE: revision_metadata_add(sha1=42abcdef, {author: "Jane Doe", ...})
-  IDX_STORAGE->>IDX_REV_META: ok
-
-  IDX_REV_META->>SCHEDULER: run Origin Metadata Indexer\non origin 42; the head is 42abcdef
-  deactivate IDX_REV_META
-
-  SCHEDULER->>IDX_ORIG_META: Index origin 42; the head is 42abcdef
-  activate IDX_ORIG_META
+    IDX_DIR_META->>IDX_STORAGE: directory_metadata_add(sha1=456789ab, {author: "Jane Doe", ...})
+    IDX_STORAGE->>IDX_DIR_META: ok
+  end
 
-  IDX_ORIG_META->>IDX_STORAGE: revision_metadata_get(sha1=42abcdef)
-  IDX_STORAGE->>IDX_ORIG_META: {author: "Jane Doe", ...}
+  IDX_DIR_META->>IDX_ORIG_META: extracted: {author: "Jane Doe", ...}
+  deactivate IDX_DIR_META
 
-  IDX_ORIG_META->>IDX_STORAGE: origin_metadata_add(id=42, {author: "Jane Doe", ...})
+  IDX_ORIG_META->>IDX_STORAGE: origin_metadata_add(id="http://example.org/repo.git", {author: "Jane Doe", ...}, from_directory=456789ab)
   IDX_STORAGE->>IDX_ORIG_META: ok
   deactivate IDX_ORIG_META
 
diff --git a/docs/metadata-workflow.rst b/docs/metadata-workflow.rst
--- a/docs/metadata-workflow.rst
+++ b/docs/metadata-workflow.rst
@@ -30,14 +30,14 @@
 (the "Head").
 Intrinsic metadata for that origin will be extracted from that revision.
 
-It schedules a Revision Metadata Indexer task for that revision, with a
-hint that the revision is the Head of that particular origin.
+It schedules a Directory Metadata Indexer task for the root directory of
+that revision.
 
 
-Revision and Content Metadata Indexers
+Directory and Content Metadata Indexers
 ______________________________________
 
-These two indexers do the hard part of the work. The Revision Metadata
+These two indexers do the hard part of the work. The Directory Metadata
 Indexer fetches the root directory associated with a revision, then extracts
 the metadata from that directory.
 
@@ -48,24 +48,21 @@
 See below for details.
 
 Their results are saved in a database (the indexer storage), associated with
-the content and revision hashes.
-
-If it received a hint that this revision is the head of an origin, the
-Revision Metadata Indexer then schedules the Origin Metadata Indexer
-to run on that origin.
+the content and directory hashes.
 
 
 Origin Metadata Indexer
 _______________________
 
 The job of this indexer is very simple: it takes an origin identifier and
-a revision hash, and copies the metadata of the former to a new table, to
-associate it with the latter.
+uses the Origin-Head and Directory indexers to get metadata from the head
+directory of an origin, and copies the metadata of the former to a new table,
+to associate it with the latter.
 
 The reason for this is to be able to perform searches on metadata, and
 efficiently find out which origins matched the pattern.
-Running that search on the ``revision_metadata`` table would require either
-a reverse lookup from revisions to origins, which is costly.
+Running that search on the ``directory_metadata`` table would require either
+a reverse lookup from directories to origins, which is costly.
 
 
 Translation from language-specific metadata to CodeMeta