diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 3ac0c91..2a1a552 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -20,4 +20,5 @@
 - Reysekha
 - igrzhukovich
 - CinnamonXI
-- AkasakaID
\ No newline at end of file
+- AkasakaID
+- Isallkun
diff --git a/README.md b/README.md
index ac443f5..52b2fa6 100644
--- a/README.md
+++ b/README.md
@@ -28,3 +28,6 @@ langkah-langkah:
 
 Sekali lagi saya ingatkan, dimohon jangan lupa masukkan nama anda di contributing.md
 Terima kasih telah berpartisipasi dengan repo ini.
+
+## LICENSE
+Distributed under the MIT License. See license.txt for more information.
diff --git a/license.txt b/license.txt
new file mode 100644
index 0000000..88b404d
--- /dev/null
+++ b/license.txt
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2022 Kodingkeun Community
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/src/Javascript/isallkun-practicesegitiga.js b/src/Javascript/isallkun-practicesegitiga.js
new file mode 100644
index 0000000..3f38e39
--- /dev/null
+++ b/src/Javascript/isallkun-practicesegitiga.js
@@ -0,0 +1,16 @@
+const printSegitiga = 5;
+
+if (typeof printSegitiga === "number") {
+  for (let i = 1; i <= printSegitiga; i++) {
+    for (let j = 1; j <= printSegitiga + 1 - i; j++) {
+      process.stdout.write(`${j} `);
+    }
+    console.log("");
+  }
+} else {
+  console.error("Data harus number");
+}
+
+// i = 1
+// printSegitiga = 5
+// 5 + 1 - 1 = 5