diff --git a/plan.md b/plan.md
new file mode 100644
index 0000000..85b871e
--- /dev/null
+++ b/plan.md
@@ -0,0 +1,17 @@
+content:{
+    ":num":{
+        ["image",
+        "video",
+        "ehtml",
+        "rpgvx"...]:{
+            ":page",
+            "thumbnail",
+        }
+    }
+}
+diff:{
+    itemNum
+    diff
+    count
+    commit
+}
\ No newline at end of file