client_test.go      | 2 ++
 cmd/torrent/main.go | 5 ++---
 mse/mse.go          | 5 +++--

diff --git a/client_test.go b/client_test.go
index 7f292d9a01c17d86c339bfa86cbb070ed131c42b..682b33f56991e7efc02a0894a94e7142e4ad94c6 100644
--- a/client_test.go
+++ b/client_test.go
@@ -943,6 +943,8 @@ 	addPeers()
 	waitTotalConns(6)
 }
 
+// Creates a file containing its own name as data. Make a metainfo from that, adds it to the given
+// client, and returns a magnet link.
 func makeMagnet(t *testing.T, cl *Client, dir string, name string) string {
 	os.MkdirAll(dir, 0770)
 	file, err := os.Create(filepath.Join(dir, name))
diff --git a/cmd/torrent/main.go b/cmd/torrent/main.go
index 67b5122bbff75eb653f00fe44d1a94199ef5feee..caac4855bb15a4d15b7027276a9625ebcd5b31af 100644
--- a/cmd/torrent/main.go
+++ b/cmd/torrent/main.go
@@ -200,9 +200,8 @@ 	}
 	defer client.Close()
 	go exitSignalHandlers(client)
 
-	// Write status on the root path on the default HTTP muxer. This will be
-	// bound to localhost somewhere if GOPPROF is set, thanks to the envpprof
-	// import.
+	// Write status on the root path on the default HTTP muxer. This will be bound to localhost
+	// somewhere if GOPPROF is set, thanks to the envpprof import.
 	http.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
 		client.WriteStatus(w)
 	})
diff --git a/mse/mse.go b/mse/mse.go
index d9b87803182726df3ce0d841e287ac8c3539f6ee..b51a5aaf45d1500bb02cbbc715cf9b4687f47ab6 100644
--- a/mse/mse.go
+++ b/mse/mse.go
@@ -25,8 +25,8 @@
 const (
 	maxPadLen = 512
 
-	CryptoMethodPlaintext CryptoMethod = 1
-	CryptoMethodRC4       CryptoMethod = 2
+	CryptoMethodPlaintext CryptoMethod = 1 // After header obfuscation, drop into plaintext
+	CryptoMethodRC4       CryptoMethod = 2 // After header obfuscation, use RC4 for the rest of the stream
 	AllSupportedCrypto                 = CryptoMethodPlaintext | CryptoMethodRC4
 )
 
@@ -557,6 +557,7 @@ // returns false or exhausted.
 type SecretKeyIter func(callback func(skey []byte) (more bool))
 
 func DefaultCryptoSelector(provided CryptoMethod) CryptoMethod {
+	// We prefer plaintext for performance reasons.
 	if provided&CryptoMethodPlaintext != 0 {
 		return CryptoMethodPlaintext
 	}