Word correction

Fixed possible mistake

docs/API.md

@@ -254,7 +254,7 @@ User's access to a topic is defined by two sets of permissions: user's desired p
 
 Topic's default access is established at the topic creation time by `{sub.desc.defacs}` and can be subsequently modified by `{set}` messages. Default access is defined for two categories of users: authenticated and anonymous. This value is applied as a default "given" permission to all new subscriptions.
 
-Client may replace explicit permissions in `{sub}` and `{set}` messages with an empty string to tell Tinode to use default permissions. If client specifies no default access permissions at topic creation time, authenticated users will receive a `RWP` permission, anonymous users will receive and empty permission which means every subscription request must be explicitly approved by the topic manager.
+Client may replace explicit permissions in `{sub}` and `{set}` messages with an empty string to tell Tinode to use default permissions. If client specifies no default access permissions at topic creation time, authenticated users will receive a `RWP` permission, anonymous users will receive an empty permission which means every subscription request must be explicitly approved by the topic manager.
 
 Access permissions can be assigned on a per-user basis by `{set}` messages.