diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..df01533
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "submodules/EVES"]
+	path = submodules/EVES
+	url = https://github.com/ASCS-eV/EVES.git
diff --git a/docs/features/registry-contracts.md b/docs/features/registry-contracts.md
index 525300a..6e3e6f9 100644
--- a/docs/features/registry-contracts.md
+++ b/docs/features/registry-contracts.md
@@ -83,3 +83,8 @@ const proposalId = receipt.logs[0].args.id;
 // Other owners must approve the proposal
 const txApprove = await multisigController.connect(owner2).approve(proposalId);
 ```
+
+## Ecosystem Specifications (EVES)
+
+For the official design rationale, including our choice of `did:ethr`, the IPFS-based CRSet structure, and the gasless onboarding relay workflows, please refer to our drafted standard:
+- **[EVES-008: ENVITED-X On-Chain Identity & Revocation Management](../../submodules/EVES/EVES/EVES-008/EVES-008.md)**
diff --git a/submodules/EVES b/submodules/EVES
new file mode 160000
index 0000000..7b69cc1
--- /dev/null
+++ b/submodules/EVES
@@ -0,0 +1 @@
+Subproject commit 7b69cc169bd2881888e0d5bf12f8b1244a042191