diff --git a/changelogs/client_server/newsfragments/1618.clarification b/changelogs/client_server/newsfragments/1618.clarification
new file mode 100644
index 00000000..b8d5169d
--- /dev/null
+++ b/changelogs/client_server/newsfragments/1618.clarification
@@ -0,0 +1 @@
+Clarify that the `via` property is required for `m.space.parent` and `m.space.child` as per MSC1772. Contributed by @PaarthShah.
diff --git a/data/event-schemas/schema/m.space.child.yaml b/data/event-schemas/schema/m.space.child.yaml
index feef0adc..c73d440f 100644
--- a/data/event-schemas/schema/m.space.child.yaml
+++ b/data/event-schemas/schema/m.space.child.yaml
@@ -34,6 +34,8 @@ properties:
           Optional (default `false`) flag to denote whether the child is "suggested" or of interest
           to members of the space. This is primarily intended as a rendering hint for clients to
           display the room differently, such as eagerly rendering them in the room list.
+    required:
+      - via
     type: object
   state_key:
     description: The child room ID being described.
diff --git a/data/event-schemas/schema/m.space.parent.yaml b/data/event-schemas/schema/m.space.parent.yaml
index ced24d70..fb633789 100644
--- a/data/event-schemas/schema/m.space.parent.yaml
+++ b/data/event-schemas/schema/m.space.parent.yaml
@@ -20,6 +20,8 @@ properties:
 
           When multiple `canonical` parents are found, the lowest parent when ordering by room ID
           lexicographically by Unicode code-points should be used.
+    required:
+      - via
     type: object
   state_key:
     description: The parent room ID.