diff --git a/event-schemas/examples/v1/m.receipt b/event-schemas/examples/v1/m.receipt
new file mode 100644
index 00000000..83515317
--- /dev/null
+++ b/event-schemas/examples/v1/m.receipt
@@ -0,0 +1,13 @@
+{
+    "type": "m.receipt",
+    "room_id": "!KpjVgQyZpzBwvMBsnT:matrix.org",
+    "content": {
+        "$1435641916114394fHBLK:matrix.org": {
+            "read": {
+                "@rikj:jki.re": {
+                    "ts": 1436451550453
+                }
+            }
+        }
+    }
+}
diff --git a/event-schemas/schema/v1/m.receipt b/event-schemas/schema/v1/m.receipt
new file mode 100644
index 00000000..4bd9f17b
--- /dev/null
+++ b/event-schemas/schema/v1/m.receipt
@@ -0,0 +1,43 @@
+{
+    "$schema": "http://json-schema.org/draft-04/schema#",
+    "type": "object",
+    "title": "Receipt Event",
+    "description": "Informs the client of new receipts.",
+    "properties": {
+        "content": {
+            "type": "object",
+            "description": "The event ids which the receipts relate to.",
+            "patternProperties": {
+                "^\\$": {
+                    "type": "object",
+                    "description": "The types of the receipts.",
+                    "additionalProperties": {
+                        "type": "object",
+                        "description": "User ids of the receipts",
+                        "patternProperties": {
+                            "^@": {
+                                "type": "object",
+                                "properties": {
+                                    "ts": {
+                                        "type": "number",
+                                        "description": "The timestamp the receipt was sent at"
+                                    }
+                                }
+                            }
+                        },
+                        "additionalProperties": false
+                    }
+                }
+            },
+            "additionalProperties": false
+        },
+        "type": {
+            "type": "string",
+            "enum": ["m.receipt"]
+        },
+        "room_id": {
+            "type": "string"
+        }
+    },
+    "required": ["room_id", "type", "content"]
+}
diff --git a/scripts/continuserv/README b/scripts/continuserv/README
new file mode 100644
index 00000000..8ce37850
--- /dev/null
+++ b/scripts/continuserv/README
@@ -0,0 +1,6 @@
+continuserv proactively re-generates the spec on filesystem changes, and serves it over HTTP.
+
+To run it, you must install the `go` tool. You will also need to install fsnotify by running:
+ `go get gopkg.in/fsnotify.v1`
+You can then run continuserv by running:
+ `go run main.go`
diff --git a/scripts/continuserv/main.go b/scripts/continuserv/main.go
index c5d623a4..e7757c06 100644
--- a/scripts/continuserv/main.go
+++ b/scripts/continuserv/main.go
@@ -68,6 +68,7 @@ func watchFS(ch chan struct{}, w *fsnotify.Watcher) {
 		case e := <-w.Events:
 			if filter(e) {
 				wg.Add(1)
+				fmt.Printf("Noticed change to %s, re-generating spec\n", e.Name)
 				ch <- struct{}{}
 			}
 		}
@@ -79,7 +80,9 @@ func makeWalker(w *fsnotify.Watcher) filepath.WalkFunc {
 		if err != nil {
 			log.Fatalf("Error walking: %v", err)
 		}
-		w.Add(path)
+		if err := w.Add(path); err != nil {
+			log.Fatalf("Failed to add watch: %v", err)
+		}
 		return nil
 	}
 }
diff --git a/specification/46_receipts.rst b/specification/46_receipts.rst
new file mode 100644
index 00000000..6428d6b5
--- /dev/null
+++ b/specification/46_receipts.rst
@@ -0,0 +1,81 @@
+Receipts
+========
+
+Receipts are used to publish which events in a room the user or their devices
+have interacted with. For example, which events the user has read.
+
+For efficiency this is done as "up to" markers, i.e. marking a particular event
+as, say, ``read`` indicates the user has read all events *up to* that event.
+
+Client-Server API
+-----------------
+
+Clients will receive receipts in the following format::
+
+     {
+        "type": "m.receipt",
+        "room_id": <room_id>,
+        "content": {
+            <event_id>: {
+                <receipt_type>: {
+                    <user_id>: { "ts": <ts>, ... },
+                    ...
+                }
+            },
+            ...
+        }
+    }
+
+For example::
+
+    {
+        "type": "m.receipt",
+        "room_id": "!KpjVgQyZpzBwvMBsnT:matrix.org",
+        "content": {
+            "$1435641916114394fHBLK:matrix.org": {
+                "read": {
+                    "@erikj:jki.re": { "ts": 1436451550453 },
+                    ...
+                }
+            },
+            ...
+        }
+    }
+
+For efficiency, receipts are batched into one event per room. In the initialSync
+and v2 sync APIs the receipts are listed in a seperate top level ``receipts``
+key.
+
+Each ``user_id``, ``receipt_type`` pair must be associated with only a single
+``event_id``.
+
+New receipts that come down the event streams are deltas. Deltas update
+existing mappings, clobbering based on ``user_id``, ``receipt_type`` pairs.
+
+
+A client can update the markers for its user by issuing a request::
+
+    POST /_matrix/client/v2_alpha/rooms/<room_id>/receipt/read/<event_id>
+
+Where the contents of the ``POST`` will be included in the content sent to
+other users. The server will automatically set the ``ts`` field.
+
+
+Server-Server API
+-----------------
+
+Receipts are sent across federation as EDUs with type ``m.receipt``. The
+format of the EDUs are::
+
+    {
+        <room_id>: {
+            <receipt_type>: {
+                <user_id>: { <content> }
+            },
+            ...
+        },
+        ...
+    }
+
+These are always sent as deltas to previously sent reciepts.
+
diff --git a/templating/matrix_templates/units.py b/templating/matrix_templates/units.py
index 150b0942..ca870571 100644
--- a/templating/matrix_templates/units.py
+++ b/templating/matrix_templates/units.py
@@ -30,7 +30,7 @@ def get_json_schema_object_fields(obj, enforce_title=False):
     }
     tables = [fields]
 
-    props = obj.get("properties")
+    props = obj.get("properties", obj.get("patternProperties"))
     parents = obj.get("allOf")
     if not props and not parents:
         raise Exception(