diff --git a/client/asset/btc/btc.go b/client/asset/btc/btc.go
index 0da4b18ac2..b936507728 100644
--- a/client/asset/btc/btc.go
+++ b/client/asset/btc/btc.go
@@ -2153,6 +2153,8 @@ func (btc *baseWallet) preRedeem(numLots, feeSuggestion uint64, options map[stri
 	}, nil
 }
 
+// PreRedeem generates an estimate of the range of redemption fees that could
+// be assessed.
 func (btc *baseWallet) PreRedeem(form *asset.PreRedeemForm) (*asset.PreRedeem, error) {
 	return btc.preRedeem(form.Lots, form.FeeSuggestion, form.SelectedOptions)
 }
diff --git a/client/mm/mm.go b/client/mm/mm.go
index bb72223445..8fb4de802e 100644
--- a/client/mm/mm.go
+++ b/client/mm/mm.go
@@ -1,3 +1,6 @@
+// This code is available on the terms of the project LICENSE.md file,
+// also available online at https://blueoakcouncil.org/license/1.0.0.
+
 package mm
 
 import (
@@ -25,6 +28,8 @@ type clientCore interface {
 	MaxSell(host string, base, quote uint32) (*core.MaxOrderEstimate, error)
 }
 
+var _ clientCore = (*core.Core)(nil)
+
 // MarketMaker handles the market making process. It supports running different
 // strategies on different markets.
 type MarketMaker struct {
diff --git a/client/mm/mm_basic.go b/client/mm/mm_basic.go
index 713fc60a91..afdc17202e 100644
--- a/client/mm/mm_basic.go
+++ b/client/mm/mm_basic.go
@@ -1,3 +1,6 @@
+// This code is available on the terms of the project LICENSE.md file,
+// also available online at https://blueoakcouncil.org/license/1.0.0.
+
 package mm
 
 import (
diff --git a/client/mm/price_oracle.go b/client/mm/price_oracle.go
index 4f2e791993..e30fa3e65b 100644
--- a/client/mm/price_oracle.go
+++ b/client/mm/price_oracle.go
@@ -1,3 +1,6 @@
+// This code is available on the terms of the project LICENSE.md file,
+// also available online at https://blueoakcouncil.org/license/1.0.0.
+
 package mm
 
 import (