diff --git a/crates/ruma-client-api/CHANGELOG.md b/crates/ruma-client-api/CHANGELOG.md
index cb93d383..591cf131 100644
--- a/crates/ruma-client-api/CHANGELOG.md
+++ b/crates/ruma-client-api/CHANGELOG.md
@@ -14,6 +14,7 @@ Improvements:
 * Add support for querying relating events (MSC2675)
 * Move `filter::RelationType` to `ruma_common::events::relations`
 * Add unstable support for discovering an OpenID Connect server (MSC2965)
+* Add `SpaceRoomJoinRule::KnockRestricted` (MSC3787)
 
 # 0.14.1
 
diff --git a/crates/ruma-client-api/src/space.rs b/crates/ruma-client-api/src/space.rs
index 4f50d180..04cc2057 100644
--- a/crates/ruma-client-api/src/space.rs
+++ b/crates/ruma-client-api/src/space.rs
@@ -164,6 +164,11 @@ pub enum SpaceRoomJoinRule {
     /// only be seen by users inside the room.
     Restricted,
 
+    /// Users can join the room if they are invited, or if they meet any of the conditions
+    /// described in a set of [`AllowRule`](ruma_common::events::room::join_rules::AllowRule)s, or
+    /// they can request an invite to the room.
+    KnockRestricted,
+
     /// Anyone can join the room without any prior action.
     Public,