diff --git a/doc/expansion/btc.json b/doc/expansion/btc.json
new file mode 100644
index 0000000..3aeceab
--- /dev/null
+++ b/doc/expansion/btc.json
@@ -0,0 +1,3 @@
+{
+    "description": "An expansion hover module to get a blockchain balance from a BTC address in MISP."
+}