diff --git a/examples/csv/coinbase-btc.csv.rules b/examples/csv/coinbase-btc.csv.rules
index fc1681063..e24b99fda 100644
--- a/examples/csv/coinbase-btc.csv.rules
+++ b/examples/csv/coinbase-btc.csv.rules
@@ -1,4 +1,5 @@
 # hledger conversion rules for coinbase report CSV
+# (https://www.coinbase.com/reports, type: transaction history)
 
 # sample:
 # Transactions