diff --git a/config/harness.yaml b/config/harness.yaml
index 7e4a83a..1ab9203 100644
--- a/config/harness.yaml
+++ b/config/harness.yaml
@@ -96,6 +96,11 @@ protectedRooms: []
 # Manually add these rooms to the protected rooms list if you want them protected.
 protectAllJoinedRooms: false
 
+# Increase this delay to have Mjölnir wait longer between two consecutive backgrounded
+# operations. The total duration of operations will be longer, but the homeserver won't
+# be affected as much. Conversely, decrease this delay to have Mjölnir chain operations
+# faster. The total duration of operations will generally be shorter, but the performance
+# of the homeserver may be more impacted.
 backgroundDelayMS: 10
 
 # Server administration commands, these commands will only work if Mjolnir is
diff --git a/src/commands/CommandHandler.ts b/src/commands/CommandHandler.ts
index 1836608..6d13c3a 100644
--- a/src/commands/CommandHandler.ts
+++ b/src/commands/CommandHandler.ts
@@ -134,7 +134,7 @@ export async function handleCommand(roomId: string, event: { content: { body: st
                 "!mjolnir redact <user ID> [room alias/ID] [limit]                   - Redacts messages by the sender in the target room (or all rooms), up to a maximum number of events in the backlog (default 1000)\n" +
                 "!mjolnir redact <event permalink>                                   - Redacts a message by permalink\n" +
                 "!mjolnir kick <glob> [room alias/ID] [reason]                    - Kicks a user or all of those matching a glob in a particular room or all protected rooms\n" +
-                "!mjolnir acl-clean [room alias/ID]                                  - Kicks all of the users from the room or all protected rooms that whose servers are banned by the room's server ACL.\n" +
+                "!mjolnir acl-clean [room alias/ID]                                  - Kicks all of the users from a room or all protected rooms (when no arguments are given) whose servers are banned by the room's server ACL event.\n" +
                 "!mjolnir rules                                                      - Lists the rules currently in use by Mjolnir\n" +
                 "!mjolnir sync                                                       - Force updates of all lists and re-apply rules\n" +
                 "!mjolnir verify                                                     - Ensures Mjolnir can moderate all your rooms\n" +