diff --git a/process/process_posix.go b/process/process_posix.go
index 92353b8..8853118 100644
--- a/process/process_posix.go
+++ b/process/process_posix.go
@@ -51,6 +51,8 @@ func getTerminalMap() (map[uint64]string, error) {
 	return ret, nil
 }
 
+// SendSignal sends a syscall.Signal to the process.
+// Currently, SIGSTOP, SIGCONT, SIGTERM and SIGKILL are supported.
 func (p *Process) SendSignal(sig syscall.Signal) error {
 	sigAsStr := "INT"
 	switch sig {
@@ -78,18 +80,27 @@ func (p *Process) SendSignal(sig syscall.Signal) error {
 	return nil
 }
 
+// Suspend sends SIGSTOP to the process.
 func (p *Process) Suspend() error {
 	return p.SendSignal(syscall.SIGSTOP)
 }
+
+// Resume sends SIGCONT to the process.
 func (p *Process) Resume() error {
 	return p.SendSignal(syscall.SIGCONT)
 }
+
+// Terminate sends SIGTERM to the process.
 func (p *Process) Terminate() error {
 	return p.SendSignal(syscall.SIGTERM)
 }
+
+// Kill sends SIGKILL to the process.
 func (p *Process) Kill() error {
 	return p.SendSignal(syscall.SIGKILL)
 }
+
+// Username returns a username of the process.
 func (p *Process) Username() (string, error) {
 	uids, err := p.Uids()
 	if err != nil {