diff --git a/README.md b/README.md
index 8ff68b4..fb430cc 100644
--- a/README.md
+++ b/README.md
@@ -3,12 +3,12 @@ KotlinBukkitKit is an API for Bukkit/SpigotAPI using features Kotlin. DevSrSouza
 
 
 ```kotlin
-implementation("tech.carcadex:kotlinbukkitkit-architecture:1.0.0.0")
-implementation("tech.carcadex:kotlinbukkitkit-extensions:1.0.0.0")
-implementation("tech.carcadex:kotlinbukkitkit-serialization:1.0.0.0")
-implementation("tech.carcadex:kotlinbukkitkit-genref:1.0.0.0")
-implementation("tech.carcadex:kotlinbukkitkit-messages:1.0.0.0")
-implementation("tech.carcadex:kotlinbukkitkit-commands:1.0.0.0")
+implementation("tech.carcadex:kotlinbukkitkit-architecture:1.0.0.1")
+implementation("tech.carcadex:kotlinbukkitkit-extensions:1.0.0.1")
+implementation("tech.carcadex:kotlinbukkitkit-serialization:1.0.0.1")
+implementation("tech.carcadex:kotlinbukkitkit-genref:1.0.0.1")
+implementation("tech.carcadex:kotlinbukkitkit-messages:1.0.0.1")
+implementation("tech.carcadex:kotlinbukkitkit-commands:1.0.0.1")
 ```
 
 
diff --git a/commands/src/main/kotlin/tech/carcadex/kotlinbukkitkit/commands/Test.kt b/commands/src/main/kotlin/tech/carcadex/kotlinbukkitkit/commands/Test.kt
new file mode 100644
index 0000000..ca3854a
--- /dev/null
+++ b/commands/src/main/kotlin/tech/carcadex/kotlinbukkitkit/commands/Test.kt
@@ -0,0 +1,21 @@
+package tech.carcadex.kotlinbukkitkit.commands
+
+import tech.carcadex.kotlinbukkitkit.architecture.KotlinPlugin
+import tech.carcadex.kotlinbukkitkit.commands.dsl.builder.simpleCommand
+
+fun KotlinPlugin.onEnable() {
+    simpleCommand(
+        name = "test",
+        permission = "test.use",
+        tabComplete = listOf("subcmd1", "subcmd2")
+    ) {
+        sender.sendMessage("test")
+        val arg1 = argument(0) //getting 1 argument of command as nullable string
+        //also you can use stringOrNull
+        val arg2 = string(1) //getting 1 argument of command as string
+        val arg3 = integer(2) //getting 2 argument of command as integer
+        //also you can use integerOrNull
+        val arg4 = double(3) //getting 3 argument of command as integer
+        //also you can use doubleOrNull
+    }
+}
\ No newline at end of file
diff --git a/commands/src/main/kotlin/tech/carcadex/kotlinbukkitkit/commands/dsl/ExecutorContext.kt b/commands/src/main/kotlin/tech/carcadex/kotlinbukkitkit/commands/dsl/ExecutorContext.kt
index 997e968..756e31f 100644
--- a/commands/src/main/kotlin/tech/carcadex/kotlinbukkitkit/commands/dsl/ExecutorContext.kt
+++ b/commands/src/main/kotlin/tech/carcadex/kotlinbukkitkit/commands/dsl/ExecutorContext.kt
@@ -1,6 +1,11 @@
 package tech.carcadex.kotlinbukkitkit.commands.dsl
 
+import org.bukkit.Bukkit
+import org.bukkit.Material
+import org.bukkit.OfflinePlayer
+import org.bukkit.World
 import org.bukkit.command.CommandSender
+import org.bukkit.entity.Player
 import tech.carcadex.kotlinbukkitkit.commands.exceptions.ArgumentNotFoundException
 import tech.carcadex.kotlinbukkitkit.commands.exceptions.TypeParseException
 import tech.carcadex.kotlinbukkitkit.commands.service.MessagesService
@@ -16,4 +21,34 @@ class ExecutorContext(var sender: CommandSender, val args: Array<String>) {
         throw TypeParseException()
     } ?: throw ArgumentNotFoundException(index)
     fun integerOrNull(index: Int): Int? = argument(index)?.toIntOrNull()
+
+    fun double(index: Int): Double = try {
+        argument(index)?.toDouble()
+    } catch (e: NumberFormatException) {
+        MessagesService.byTag("#not-a-number")(sender)
+        throw TypeParseException()
+    } ?: throw ArgumentNotFoundException(index)
+    fun doubleOrNull(index: Int): Double? = argument(index)?.toDoubleOrNull()
+
+    fun materialOrNull(index: Int): Material? = Material.matchMaterial(string(index))
+    fun material(index: Int): Material =
+        materialOrNull(index) ?: run {
+            MessagesService.byTag("#no-such-material")(sender)
+            throw TypeParseException()
+        }
+    fun worldOrNull(index: Int): World? = Bukkit.getWorld(string(index))
+    fun world(index: Int): World =
+        worldOrNull(index) ?: run {
+            MessagesService.byTag("#no-such-world")(sender)
+            throw TypeParseException()
+        }
+
+    fun playerOrNull(index: Int): Player? = Bukkit.getPlayer(string(index))
+    fun player(index: Int): World =
+        worldOrNull(index) ?: run {
+            MessagesService.byTag("#no-such-player")(sender)
+            throw TypeParseException()
+        }
+
+    fun offlinePlayer(index: Int): OfflinePlayer = Bukkit.getOfflinePlayer(string(index))
 }
\ No newline at end of file
diff --git a/commands/src/main/kotlin/tech/carcadex/kotlinbukkitkit/commands/service/MessagesService.kt b/commands/src/main/kotlin/tech/carcadex/kotlinbukkitkit/commands/service/MessagesService.kt
index 6793217..209f159 100644
--- a/commands/src/main/kotlin/tech/carcadex/kotlinbukkitkit/commands/service/MessagesService.kt
+++ b/commands/src/main/kotlin/tech/carcadex/kotlinbukkitkit/commands/service/MessagesService.kt
@@ -11,6 +11,7 @@ object MessagesService {
         messages["#no-such-player"] = { it.sendMessage("${ChatColor.RED}No such player was found") }
         messages["#no-such-world"] = { it.sendMessage("${ChatColor.RED}No such world was found") }
         messages["#no-such-material"] = { it.sendMessage("${ChatColor.RED}No such material was found") }
+        messages["#no-such-world"] = { it.sendMessage("${ChatColor.RED}No such world was found") }
         messages["#no-such-enum"] = { it.sendMessage("${ChatColor.RED}No such value for this enum was found") }
         messages["#not-a-number"] = { it.sendMessage("${ChatColor.RED}It is not a number") }
         messages["#wrong-usage"] = { it.sendMessage("${ChatColor.RED}Wrong usage of command") }
diff --git a/extensions/src/main/kotlin/tech/carcadex/kotlinbukkitkit/extensions/ExCommandSender.kt b/extensions/src/main/kotlin/tech/carcadex/kotlinbukkitkit/extensions/ExCommandSender.kt
new file mode 100644
index 0000000..4e75622
--- /dev/null
+++ b/extensions/src/main/kotlin/tech/carcadex/kotlinbukkitkit/extensions/ExCommandSender.kt
@@ -0,0 +1,9 @@
+package tech.carcadex.kotlinbukkitkit.extensions
+
+import org.bukkit.command.CommandSender
+
+public fun CommandSender.send(message: String) {
+    sendMessage(message)
+}
+
+public fun CommandSender.hasNotPerm(permission: String) = (!hasPermission(permission))
\ No newline at end of file
diff --git a/settings.gradle.kts b/settings.gradle.kts
index 685ff43..96a784b 100644
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -1,5 +1,5 @@
 
-rootProject.name = "kotlinbukkitkit"
+rootProject.name = "KotlinBukkitKit"
 include("architecture")
 include("messages")
 include("extensions")