diff --git a/src/main/kotlin/ru/dbotthepony/kommons/util/MailboxExecutorService.kt b/src/main/kotlin/ru/dbotthepony/kommons/util/MailboxExecutorService.kt
index b5c8aa3..c13b5e6 100644
--- a/src/main/kotlin/ru/dbotthepony/kommons/util/MailboxExecutorService.kt
+++ b/src/main/kotlin/ru/dbotthepony/kommons/util/MailboxExecutorService.kt
@@ -36,6 +36,12 @@ private fun <E : Comparable<E>> LinkedList<E>.enqueue(value: E) {
 	}
 }
 
+/**
+ * [ScheduledExecutorService] which act as a mailbox, [executeQueuedTasks] must be called from main thread.
+ *
+ * [submit], [execute], etc can be called on any thread. If any of enqueueing methods are called on the same thread
+ * as where [executeQueuedTasks] was called, executes provided lambda immediately and returns completed future.
+ */
 class MailboxExecutorService(thread: Thread = Thread.currentThread()) : ScheduledExecutorService {
 	@Volatile
 	var thread: Thread = thread