diff --git a/MEMO.md b/MEMO.md
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@@ -0,0 +1,48 @@
+# MEMO
+
+This file contains my personal notes. Most of it isn't particularly useful, but it might come in handy for someone.
+
+## Regarding the Game Package Patch Update v2 Format
+
+Although removed from the archived data, keys indicating the implementation of the v2 format appeared in the JSON data even before the `v1.2.4` update.  
+The keys were first observed on the China channel at `2026-04-09T08:15:27.604+00:00` and on the Global channel at `2026-04-11T04:15:27.695+00:00`.
+
+Initially, the `patch` object contained empty data: `{ "v2_patch_info_url": "", "v2_patch_info_size": "0", "v2_patch_info_md5": "" }`.  
+Upon the release of the `v1.2.4` update, the official URL, size, and MD5 values began to be returned.
+
+### `patch.json` Specifications
+
+**Note:** These are based partly on conjecture.
+
+```typescript
+export interface Root {
+  version: string; // e.g., 1.2.4
+  vfs_base_path: string; // e.g., Endfield_Data/StreamingAssets/VFS
+  files: File[];
+}
+
+export interface File {
+  name: string; // e.g., C3442D43/223F9ED9DB4013D27E6FB3B78623E051.chk
+  name_path: string; // ""
+  md5: string; // e.g., 1ceb1c5aaf4dace09f3ec359c78f0501
+  size: number; // e.g., 4516428
+  diffType: 1 | 2; // 1=chk?, 2=blk?
+  local_path?: string; // e.g., vfs_files/files/Endfield_Data/StreamingAssets/VFS/775A31D1/449D95744A00F33BD9C304EF1E72A534.chk
+  patch?: Patch[];
+}
+
+export interface Patch {
+  base_file: string; // e.g., C3442D43/47D0EB2D178F6E81EE4D0226E0806AB9.chk
+  base_file_path: string; // ""
+  base_md5: string; // e.g., dac0d4c6a910fb4e1000d9414cd1ee4b
+  base_size: number; // e.g., 4518476
+  patch: string; // e.g., diff_1.2.4_1.1.9/C3442D43_223F9ED9DB4013D27E6FB3B78623E051.chk_patch
+  patch_path: string; // ""
+  patch_size: number; // e.g., 136568
+}
+```
+
+- **If `local_path` does not exist and `patch` does not exist:** No action is taken.
+- **If `local_path` exists and `patch` does not exist (Incremental):** A new file exists. Copy the file located at `local_path` within the patch data to `${vfs_base_path}/${files[number].name}`.
+- **If `local_path` does not exist and `patch` exists (Differential):** A difference exists. Using `${vfs_base_path}/${files[number].base_file}` as the source file, apply the patch found at `vfs_files/vfs_patch/${files[number].patch[number].patch}` in the patch data and write the result to `${vfs_base_path}/${files[number].name}`. [HDiffPatch](https://github.com/sisong/HDiffPatch) is used for applying the differential.
+- **If both `local_path` and `patch` exist:** This scenario is currently not possible.
diff --git a/README.md b/README.md
index 6a279153..7ddba751 100644
--- a/README.md
+++ b/README.md
@@ -19,9 +19,6 @@ For a historical overview of game packages and other resources, please click the
 
 ## Contents of the Archive
 
-> [!NOTE]
-> Hypergryph is planning to adopt the `v2` format for game package patch updates. I will implement it as soon as the specifications are confirmed.
-
 The following APIs are currently being monitored:
 - Launcher
   - Get latest game (Global, China)