Added some more comments.

configuration.go

@@ -8,7 +8,7 @@ import (
 	"strings"
 )
 
-// Configuration holds a list of process names to be tracked and a listen address.
+// Configuration holds a configuration for the service.
 type Configuration struct {
 	ListenAddress  string
 	IndentedOutput bool
@@ -51,7 +51,7 @@ func LoadConfiguration(path string) (conf *Configuration, err error) {
 	return conf, nil
 }
 
-// StoreConfiguration writes Configuration into a file.
+// StoreConfiguration writes configuration into a file.
 func (conf *Configuration) StoreConfiguration(path string) (err error) {
 	var config strings.Builder
 

proc.go

@@ -17,6 +17,9 @@ func GetProcessPIDs(name string) ([]int, error) {
 	}
 
 	for _, entry := range dir {
+		// This line demands a little clarification. Here we are making sure
+		// that the first character of a directory name is numeric. In ASCII
+		// all numerals are laying within 0x30-0x39 range.
 		if entry.IsDir() && entry.Name()[0]>>0x4&0xf == 0x3 {
 			cmdline, err := os.ReadFile("/proc/" + entry.Name() + "/cmdline")
 			if err != nil {

processlist.go

@@ -4,10 +4,10 @@ import (
 	"encoding/xml"
 )
 
-// ProcessList is a map of processes' statuses.
+// ProcessList is a map of processes' names and its statuses.
 type ProcessList map[string]bool
 
-// MarshalXML implements Marshaler interface for a ProcessList.
+// MarshalXML implements XML Marshaler interface for a ProcessList.
 func (l *ProcessList) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
 	if len(*l) == 0 {
 		return nil