diff --git a/controller/hd44780/hd44780_test.go b/controller/hd44780/hd44780_test.go
index b05dddc..40b3e2a 100644
--- a/controller/hd44780/hd44780_test.go
+++ b/controller/hd44780/hd44780_test.go
@@ -131,6 +131,7 @@ type mockI2CBus struct {
 	closed bool
 }
 
+func (bus *mockI2CBus) ReadBytes(addr byte, num int) ([]byte, error) 	  { return []byte{0x00}, nil }
 func (bus *mockI2CBus) ReadByte(addr byte) (byte, error)                  { return 0x00, nil }
 func (bus *mockI2CBus) WriteBytes(addr byte, value []byte) error          { return nil }
 func (bus *mockI2CBus) ReadFromReg(addr, reg byte, value []byte) error    { return nil }
diff --git a/i2c.go b/i2c.go
index d9922ed..41244ea 100644
--- a/i2c.go
+++ b/i2c.go
@@ -6,7 +6,7 @@ package embd
 type I2CBus interface {
 	// ReadByte reads a byte from the given address.
 	ReadBytes(addr byte, num int) (value []byte, err error)
-	// ReadByte reads a byte from the given address.
+	// ReadByte reads a slice of bytes from the given address.
 	ReadByte(addr byte) (value byte, err error)
 	// WriteByte writes a byte to the given address.
 	WriteByte(addr, value byte) error