diff --git a/README.md b/README.md
index 901fa66..7f904d5 100644
--- a/README.md
+++ b/README.md
@@ -4,3 +4,40 @@ Rust script index
 
 This is a index for rust-script-base
 
+## Index repo format
+
+For example have scripts:
+* sample.crs
+* commit-msg.crs
+
+```
+scripts.txt
+/s
+  /a
+    /m
+      /sample.crs
+        /v0001-0.1.0
+          /sample.crs.json
+/c
+  /o
+    /m
+      /commit-msg.crs
+        /v0001-1.0.0
+          /commit-msg.crs.json
+```
+
+scripts.txt format:
+```
+sample.crs
+commit-msg.crs
+```
+
+JSON format:
+```json
+{
+    "name": "sample.crs",
+    "hash": "sha256-xxXXxxXX",
+    "repo": "https://git.hatter.ink/rust-scripts/rust-script-base",
+    "gitHash": "xxXXxxXX"
+}
+```