diff --git a/bitcoin/Cargo.toml b/bitcoin/Cargo.toml
index 7c63520b0..14cf40057 100644
--- a/bitcoin/Cargo.toml
+++ b/bitcoin/Cargo.toml
@@ -13,6 +13,7 @@ edition = "2021"
 rust-version = "1.56.1"
 exclude = ["tests", "contrib"]
 
+# If you change features or optional dependencies in any way please update the "# Cargo features" section in lib.rs as well.
 [features]
 default = [ "std", "secp-recovery" ]
 std = ["base58/std", "bech32/std", "hashes/std", "hex/std", "internals/std", "io/std", "secp256k1/std", "units/std"]