diff --git a/README.md b/README.md
index 14c10ec..ea0738a 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,39 @@ If you're an Arch Linux user, you can install it from
 
 `% yay -S syg_go`
 
+### Features
+
+* regex-based key mining (see `-regex`)
+* bruteforce-resistant keys mining mode (see `-highaddr`)
+* multithreaded key mining (see `-threads`)
+
+### Usage
+
+```
+% syg_go -help
+Usage of syg_go:
+  -highaddr
+        high address mining mode, excludes regex
+  -iter uint
+        per how many iterations to output status (default 100000)
+  -original
+        use original Yggdrasil code
+  -regex string
+        regex to match addresses against (default "::")
+  -threads int
+        how many threads to use for mining (default 16)
+  -version
+        display version
+```
+
+This program outputs keys found to stdout and iterations numbers reached
+to stderr so that users can redirect the (possibly) irrelevant status
+output to /dev/null. To redirect status output to /dev/null, run:
+
+```
+% syg_go ...flags... 2>/dev/null
+```
+
 ### History
 
 [SimpleYggGen](https://notabug.org/acetone/SimpleYggGen-Bash) is originally a
@@ -50,25 +83,6 @@ This program contains some modded code from Yggdrasil that aims to improve
 performance. If you prefer to use original Yggdrasil code, set `-original`
 flag.
 
-### Usage
-
-```
-% syg_go -help
-Usage of syg_go:
-  -highaddr
-        high address mining mode, excludes regex
-  -iter uint
-        per how many iterations to output status (default 100000)
-  -original
-        use original Yggdrasil code
-  -regex string
-        regex to match addresses against (default "::")
-  -threads int
-        how many threads to use for mining (default 16)
-  -version
-        display version
-```
-
 ### Development
 
 `go tool pprof` support is available when building with `-tags debug`. The
diff --git a/debug.go b/debug.go
index f10ac30..7d2f07c 100644
--- a/debug.go
+++ b/debug.go
@@ -3,7 +3,6 @@
 package main
 
 import (
-	"log"
 	"net/http"
 	_ "net/http/pprof"
 	"os"
@@ -14,10 +13,10 @@ func init() {
 	if listen == "" {
 		listen = "[::]:8082"
 	}
-	log.Printf("profiling is enabled, HTTP server is attached to %s\n", listen)
+	stdout.Printf("profiling is enabled, HTTP server is attached to %s\n", listen)
 	go func() {
 		if err := http.ListenAndServe(listen, nil); err != nil {
-			log.Fatalf("http failed: %v\n", err)
+			stderr.Fatalf("http failed: %v\n", err)
 		}
 	}()
 }
diff --git a/main.go b/main.go
index 8e2f929..24a6eda 100644
--- a/main.go
+++ b/main.go
@@ -20,7 +20,16 @@ import (
 	"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
 )
 
-var version = "v0.1.3"
+var (
+	programName = "syg_go"
+	version     = "v0.1.4"
+	copyright   = "Copyright (c) 2020 Timur Demin"
+)
+
+var (
+	stdout = log.New(os.Stdout, "", log.Flags())
+	stderr = log.New(os.Stderr, "", log.Flags())
+)
 
 func main() {
 	rxflag := flag.String("regex", "::", "regex to match addresses against")
@@ -31,21 +40,22 @@ func main() {
 	highAddressMode := flag.Bool("highaddr", false, "high address mining mode, excludes regex")
 	flag.Parse()
 	if *displayVersion {
-		println("syg_go", version)
+		println(programName, version)
+		println(copyright)
 		return
 	}
 
 	if *origCode {
-		log.Println("using unmodified Yggdrasil code")
+		stdout.Println("using unmodified Yggdrasil code")
 		addrForNodeID = address.AddrForNodeID
 	} else {
-		log.Println("using syg_go vendored code")
+		stdout.Println("using syg_go vendored code")
 		addrForNodeID = AddrForNodeID
 	}
 
 	regex, err := regexp.Compile(*rxflag)
 	if err != nil {
-		log.Printf("%v\n", err)
+		stderr.Printf("%v\n", err)
 		os.Exit(1)
 	}
 
@@ -53,9 +63,9 @@ func main() {
 	var currentBest []byte
 
 	if !*highAddressMode {
-		log.Printf("starting mining for %v with %v threads\n", regex, *threads)
+		stdout.Printf("starting mining for %v with %v threads\n", regex, *threads)
 	} else {
-		log.Printf("starting mining higher addresses with %v threads\n", *threads)
+		stdout.Printf("starting mining higher addresses with %v threads\n", *threads)
 	}
 	for i := 0; i < *threads; i++ {
 		go doBoxKeys(newKeys)
@@ -71,7 +81,7 @@ func main() {
 			}
 			counter++
 			if counter%i == 0 {
-				log.Printf("reached %v iterations\n", counter)
+				stderr.Printf("reached %v iterations\n", counter)
 			}
 		}
 	} else {
@@ -83,7 +93,7 @@ func main() {
 			}
 			counter++
 			if counter%i == 0 {
-				log.Printf("reached %v iterations\n", counter)
+				stderr.Printf("reached %v iterations\n", counter)
 			}
 		}
 	}
@@ -97,7 +107,7 @@ type keySet struct {
 }
 
 func (k *keySet) print() {
-	log.Printf("priv: %s | pub: %s | nodeid: %s | ip: %s\n",
+	stdout.Printf("priv: %s | pub: %s | nodeid: %s | ip: %s\n",
 		hex.EncodeToString(k.priv[:]),
 		hex.EncodeToString(k.pub[:]),
 		hex.EncodeToString(k.id[:]),