diff --git a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/command/resolve/BuiltInCommandCallResolver.kt b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/command/resolve/BuiltInCommandCallResolver.kt
index d1cdf647e..58d420c56 100644
--- a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/command/resolve/BuiltInCommandCallResolver.kt
+++ b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/command/resolve/BuiltInCommandCallResolver.kt
@@ -12,6 +12,9 @@ import net.mamoe.mirai.console.util.cast
 import net.mamoe.mirai.console.util.safeCast
 import java.util.*
 
+/**
+ * Builtin implementation of [CommandCallResolver]
+ */
 @ConsoleExperimentalApi
 @ExperimentalCommandDescriptors
 public object BuiltInCommandCallResolver : CommandCallResolver {
diff --git a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/command/resolve/CommandCallResolver.kt b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/command/resolve/CommandCallResolver.kt
index 6e8eda94e..b4671412f 100644
--- a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/command/resolve/CommandCallResolver.kt
+++ b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/command/resolve/CommandCallResolver.kt
@@ -11,9 +11,13 @@ package net.mamoe.mirai.console.command.resolve
 
 import net.mamoe.mirai.console.command.descriptor.ExperimentalCommandDescriptors
 import net.mamoe.mirai.console.command.parse.CommandCall
+import net.mamoe.mirai.console.extensions.CommandCallResolverProvider
 
 /**
  * The resolver converting a [CommandCall] into [ResolvedCommandCall] based on registered []
+ *
+ * @see CommandCallResolverProvider The provider to instances of this class
+ * @see BuiltInCommandCallResolver The builtin implementation
  */
 @ExperimentalCommandDescriptors
 public interface CommandCallResolver {
diff --git a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/util/StandardUtils.kt b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/util/StandardUtils.kt
index c2eb22a0c..0d7dc8630 100644
--- a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/util/StandardUtils.kt
+++ b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/util/StandardUtils.kt
@@ -11,6 +11,10 @@ package net.mamoe.mirai.console.util
 
 import kotlin.contracts.contract
 
+/**
+ * Perform `this as? T`.
+ */
+@JvmSynthetic
 public inline fun <reified T : Any> Any?.safeCast(): T? {
     contract {
         returnsNotNull() implies (this@safeCast is T)
@@ -18,6 +22,10 @@ public inline fun <reified T : Any> Any?.safeCast(): T? {
     return this as? T
 }
 
+/**
+ * Perform `this as T`.
+ */
+@JvmSynthetic
 public inline fun <reified T : Any> Any?.cast(): T {
     contract {
         returns() implies (this@cast is T)