diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..fee72f0
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "subgraphs"]
+	path = subgraphs
+	url = git@github.com:gosuto-inzasheru/erc20-subgraph-approvals.git
diff --git a/README.md b/README.md
index a12a720..2c5aac4 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,9 @@
 
 ```
 $ poetry install
+$ git submodule update --init --recursive
 ```
+That last command clones (or updates) the `erc20-subgraph-approvals` repo in `subgraphs/`.
 
 You will also need [`ganache`](https://trufflesuite.com/docs/ganache/). If not installed yet:
 ```
diff --git a/subgraphs b/subgraphs
new file mode 160000
index 0000000..8ac9b53
--- /dev/null
+++ b/subgraphs
@@ -0,0 +1 @@
+Subproject commit 8ac9b539bb4f9fec8f17a14c6533020b45492cd5