diff --git a/content/rooms/fragments/v1-auth-rules.md b/content/rooms/fragments/v1-auth-rules.md
index d438d514..b0907829 100644
--- a/content/rooms/fragments/v1-auth-rules.md
+++ b/content/rooms/fragments/v1-auth-rules.md
@@ -45,7 +45,8 @@ The rules are as follows:
     2.  If sender's domain doesn't matches `state_key`, reject.
     3.  Otherwise, allow.
 5.  If type is `m.room.member`:
-    1.  If no `state_key` key or `membership` key in `content`, reject.
+    1.  If there is no `state_key` property, or no `membership` property in
+        `content`, reject.
     2.  If `membership` is `join`:
         1.  If the only previous event is an `m.room.create` and the
             `state_key` is the creator, allow.
diff --git a/content/rooms/fragments/v3-auth-rules.md b/content/rooms/fragments/v3-auth-rules.md
index 2f5c8b52..7a8bc23b 100644
--- a/content/rooms/fragments/v3-auth-rules.md
+++ b/content/rooms/fragments/v3-auth-rules.md
@@ -52,7 +52,8 @@ The complete list of rules, as of room version 3, is as follows:
     2.  If sender's domain doesn't matches `state_key`, reject.
     3.  Otherwise, allow.
 5.  If type is `m.room.member`:
-    1.  If no `state_key` key or `membership` key in `content`, reject.
+    1.  If there is no `state_key` property, or no `membership` property in
+        `content`, reject.
     2.  If `membership` is `join`:
         1.  If the only previous event is an `m.room.create` and the
             `state_key` is the creator, allow.
diff --git a/content/rooms/fragments/v8-auth-rules.md b/content/rooms/fragments/v8-auth-rules.md
index e1a762a3..90ba02b0 100644
--- a/content/rooms/fragments/v8-auth-rules.md
+++ b/content/rooms/fragments/v8-auth-rules.md
@@ -49,7 +49,8 @@ The rules are as follows:
    property `m.federate` set to `false`, and the `sender` domain of the event
    does not match the `sender` domain of the create event, reject.
 4.  If type is `m.room.member`:
-    1.  If no `state_key` key or `membership` key in `content`, reject.
+    1.  If there is no `state_key` property, or no `membership` property in
+        `content`, reject.
     2.  If `content` has a `join_authorised_via_users_server`
         key:
         1.  If the event is not validly signed by the homeserver of the user ID denoted
diff --git a/content/rooms/v10.md b/content/rooms/v10.md
index d5979d91..c34029ec 100644
--- a/content/rooms/v10.md
+++ b/content/rooms/v10.md
@@ -121,7 +121,8 @@ The rules are as follows:
    property `m.federate` set to `false`, and the `sender` domain of the event
    does not match the `sender` domain of the create event, reject.
 4.  If type is `m.room.member`:
-    1.  If no `state_key` key or `membership` key in `content`, reject.
+    1.  If there is no `state_key` property, or no `membership` property in
+        `content`, reject.
     2.  If `content` has a `join_authorised_via_users_server`
         key:
         1.  If the event is not validly signed by the homeserver of the user ID denoted
diff --git a/content/rooms/v6.md b/content/rooms/v6.md
index c88887da..eed37bea 100644
--- a/content/rooms/v6.md
+++ b/content/rooms/v6.md
@@ -90,7 +90,8 @@ The rules are as follows:
 3.  If event does not have a `m.room.create` in its `auth_events`,
     reject.
 4.  If type is `m.room.member`:
-    1.  If no `state_key` key or `membership` key in `content`, reject.
+    1.  If there is no `state_key` property, or no `membership` property in
+        `content`, reject.
     2.  If `membership` is `join`:
         1.  If the only previous event is an `m.room.create` and the
             `state_key` is the creator, allow.
diff --git a/content/rooms/v7.md b/content/rooms/v7.md
index 8a0a8294..87dea0e2 100644
--- a/content/rooms/v7.md
+++ b/content/rooms/v7.md
@@ -76,7 +76,8 @@ The rules are as follows:
 3.  If event does not have a `m.room.create` in its `auth_events`,
     reject.
 4.  If type is `m.room.member`:
-    1.  If no `state_key` key or `membership` key in `content`, reject.
+    1.  If there is no `state_key` property, or no `membership` property in
+        `content`, reject.
     2.  If `membership` is `join`:
         1.  If the only previous event is an `m.room.create` and the
             `state_key` is the creator, allow.