diff --git a/main.go b/main.go
index 23c2209..bd89bec 100644
--- a/main.go
+++ b/main.go
@@ -7,8 +7,11 @@ import (
 	"time"
 
 	"github.com/eiannone/keyboard"
+	"github.com/everdev/mack"
 )
 
+var notified = false
+
 func main() {
 	var duration string
 	var offset string
@@ -60,7 +63,7 @@ func main() {
 
 	go func() {
 		last := time.Now()
-		printTime(cur, base, &delim, invert)
+		printTime(&cur, base, &delim, invert)
 		for {
 			select {
 			case <-monitor.C:
@@ -81,7 +84,7 @@ func main() {
 				return
 			}
 			last = time.Now()
-			printTime(cur, base, &delim, invert)
+			printTime(&cur, base, &delim, invert)
 		}
 	}()
 
@@ -106,10 +109,13 @@ func main() {
 	}
 }
 
-func printTime(remains time.Duration, target time.Duration, delim *rune, reverse bool) {
+func printTime(pRemains *time.Duration, target time.Duration, delim *rune, reverse bool) {
+	remains := *pRemains
 	sec := remains.Seconds()
-	hrs := int(sec / 60.0)
+	min := int(sec / 60.0)
 	seconds := int(sec) % 60
+	hrs := min / 60
+	min = min % 60
 	if *delim == ':' {
 		*delim = ' '
 	} else {
@@ -117,10 +123,39 @@ func printTime(remains time.Duration, target time.Duration, delim *rune, reverse
 	}
 	if reverse {
 		remains := target - remains
-		rHrs := int(remains.Seconds() / 60.0)
+		rMin := int(remains.Seconds() / 60.0)
 		rSec := int(remains.Seconds()) % 60
-		fmt.Printf("\rAt: %d%c%02d\tRemaining: %d%c%02d", hrs, byte(*delim), seconds, rHrs, byte(*delim), rSec)
+		rHrs := rMin / 60
+		rMin = rMin % 60
+		tdelim := byte(*delim)
+		if remains < 0 {
+			rMin = 0
+			rSec = 0
+			rHrs = 0
+			tdelim = ':'
+			go alertTime(pRemains, target, reverse)
+		}
+		fmt.Printf("\rAt: %2d%c%02d%c%02d\tRemaining: %2d%c%02d%c%02d", hrs, byte(*delim), min, byte(*delim), seconds, rHrs, tdelim, rMin, tdelim, rSec)
 	} else {
-		fmt.Printf("\rRemaining: %d%c%02d", hrs, byte(*delim), seconds)
+		fmt.Printf("\rRemaining: %2d%c%02d%c%02d", hrs, byte(*delim), min, byte(*delim), seconds)
+		if remains < 0 {
+			go alertTime(pRemains, target, reverse)
+		}
+	}
+}
+
+func alertTime(pRemains *time.Duration, target time.Duration, reverse bool) {
+	if !notified {
+		notified = true
+		_, err := mack.Alert("Alert")
+		if err != nil {
+			panic(err)
+		}
+		if reverse {
+			*pRemains -= target
+		} else {
+			*pRemains += target
+		}
+		notified = false
 	}
 }