diff --git a/bufferpool.go b/bufferpool.go
index 2507ddf..487ac4a 100644
--- a/bufferpool.go
+++ b/bufferpool.go
@@ -50,6 +50,7 @@ func (bp *bufferPool) Get() []byte {
 
 // Put returns a buffer to the pool.
 func (bp *bufferPool) Put(buf []byte) {
+	// Only put back buffers of the correct size.
 	if cap(buf) != mtuLimit {
 		return
 	}
diff --git a/sess.go b/sess.go
index 29247c3..3334921 100644
--- a/sess.go
+++ b/sess.go
@@ -292,7 +292,7 @@ RESET_TIMER:
 				s.recvbuf = make([]byte, size)
 			}
 
-			// resize the length of recvbuf to correspond to data size
+			// resize the length of recvbuf to match the data size
 			s.recvbuf = s.recvbuf[:size]
 			s.kcp.Recv(s.recvbuf)    // read data to recvbuf first
 			n = copy(b, s.recvbuf)   // then copy bytes to 'b' as many as possible
diff --git a/tx.go b/tx.go
index ab5527e..9fe6e7b 100644
--- a/tx.go
+++ b/tx.go
@@ -29,7 +29,7 @@ import (
 	"golang.org/x/net/ipv4"
 )
 
-// defaultTx is the default procedure to transmit data
+// defaultTx is the default transmission function for UDP sessions.
 func (s *UDPSession) defaultTx(txqueue []ipv4.Message) {
 	nbytes := 0
 	npkts := 0
diff --git a/tx_linux.go b/tx_linux.go
index 455a193..b3ba113 100644
--- a/tx_linux.go
+++ b/tx_linux.go
@@ -31,7 +31,8 @@ import (
 	"golang.org/x/net/ipv4"
 )
 
-// tx is the optimized procedure to transmit packets utilizing the linux sendmmsg system call
+// tx is the optimized procedure to transmit packets utilizing
+// batch write syscall on linux platform.
 func (s *UDPSession) tx(txqueue []ipv4.Message) {
 	// default version
 	if s.platform.batchConn == nil {