diff --git a/README.md b/README.md
index a34f236..3f2bb9c 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,7 @@
 # You may have questions
 
 ONLang - Object Notation Language (js`ON`)
+VSCode extension - [OnLang](https://marketplace.visualstudio.com/items?itemName=artegoser.onlang)
 
 ## 1. God, what the f\*\*\*\* is this
 
diff --git a/examples/example.json5 b/examples/example.onla
similarity index 98%
rename from examples/example.json5
rename to examples/example.onla
index d2f3783..3426435 100644
--- a/examples/example.json5
+++ b/examples/example.onla
@@ -1,5 +1,3 @@
-// Now the file with the extension .json5, but then it will be .onla
-
 [
   {
     print: [
diff --git a/examples/factorial.json5 b/examples/factorial.onla
similarity index 98%
rename from examples/factorial.json5
rename to examples/factorial.onla
index 8f57383..a626bd0 100644
--- a/examples/factorial.json5
+++ b/examples/factorial.onla
@@ -74,4 +74,5 @@
   //   "21! == 51 090 942 171 709 440 000: ",
   //   { _eq: [{ fact: [21] }, 51090942171709440000] },
   // ], some json and yaml troubles with number `51090942171709440000`
+  { calc: ["operand", "+", "operand"] }
 ]