diff --git a/crontab.go b/crontab.go
index a11682b..7d7a424 100644
--- a/crontab.go
+++ b/crontab.go
@@ -219,7 +219,7 @@ func (cron *Crontab) linuxTimeUp() bool {
 	createlen := 500
 
 	plen := len(cron.WillPlans)
-	if plen <= createlen {
+	if plen <= createlen { // 如果当前生成的计划表少于 限制的500. 就生成新的计划表
 		var lastplan time.Time
 		if plen == 0 {
 			lastplan = now
@@ -237,9 +237,13 @@ func (cron *Crontab) linuxTimeUp() bool {
 	if len(cron.WillPlans) > 0 {
 		istimeup := false
 		for i := 0; i < maxlen; i++ {
+
+			// 统计过了多少计划任务时间表 i - 1
 			if now.Unix() >= cron.WillPlans[i].Unix() {
 				istimeup = true
 			} else {
+
+				// 清除过时的计划任务时间表
 				if istimeup {
 					if i-1 > 0 {
 						cron.SkipPlans = append(cron.SkipPlans, cron.WillPlans[0:i-1]...)
@@ -254,7 +258,7 @@ func (cron *Crontab) linuxTimeUp() bool {
 				return istimeup
 			}
 		}
-
+		// 如果所有计划表都不符合, 全部放到忽略的计划表上, 这个表方便打印查看, 因为程序执行超时过了多少计划任务
 		cron.SkipPlans = append(cron.SkipPlans, cron.WillPlans...)
 		cron.WillPlans = nil
 		return istimeup
@@ -289,10 +293,10 @@ func (cron *Crontab) intervalCalculateNextTime(now time.Time) {
 				isecond = 0
 			}
 
-		} else {
-			log.Println("success:", cron.trueCount, "count time wait:", isecond, "s")
 		}
 
+		log.Println("success:", cron.trueCount, "count time wait:", isecond, "s")
+
 	} else {
 
 		cron.failCount++
diff --git a/crontab_test.go b/crontab_test.go
index fcb7225..7effffd 100644
--- a/crontab_test.go
+++ b/crontab_test.go
@@ -6,6 +6,8 @@ import (
 	"runtime"
 	"testing"
 	"time"
+
+	"github.com/satori/go.uuid"
 )
 
 // type LRValue struct {
@@ -67,7 +69,11 @@ func isInRangeTime(sec, t float64) error {
 }
 
 func TestParseIntervalOnline1(t *testing.T) {
+	uid, _ := uuid.NewV4()
+	log.Println(string(uid.Bytes()))
 
+	crontab := "f[c > 2]=3|s[c <= 2]"
+	log.Println(crontab)
 }
 
 func TestParseIntervalPlus(t *testing.T) {
diff --git a/trie_year.go b/trie_year.go
index 55f65c5..f7b0094 100644
--- a/trie_year.go
+++ b/trie_year.go
@@ -123,7 +123,7 @@ func (ty *trieYear) GetPlanTime(cron *Crontab, aftertime time.Time, count uint)
 			for j := 1; j <= 31; j++ {
 
 				if nmonth == i {
-					if j < nday {
+					if j < nday { // 获取当天的计划表
 						continue
 					}
 				}
@@ -132,7 +132,7 @@ func (ty *trieYear) GetPlanTime(cron *Crontab, aftertime time.Time, count uint)
 				if day != nil {
 
 					if day.IsClear {
-						insertHour(cron, day)
+						insertHour(cron, day) // 生成小时的计划表
 					}
 
 					for k := 0; k <= 23; k++ {
@@ -144,7 +144,7 @@ func (ty *trieYear) GetPlanTime(cron *Crontab, aftertime time.Time, count uint)
 						}
 
 						hour := day.Hour[k]
-
+						// 遍历24小时 生成需要的计划表
 						if hour != nil {
 
 							for n := 0; n <= 59; n++ {
@@ -159,7 +159,7 @@ func (ty *trieYear) GetPlanTime(cron *Crontab, aftertime time.Time, count uint)
 
 									curTime := time.Date(ty.Year, time.Month(i), j, k, n, 0, 0, time.Local)
 									result = append(result, curTime)
-									count--
+									count-- // 统计完当前需要的计划任务后就结束
 									if count <= 0 {
 										ty.clearHour()
 										return result
@@ -168,8 +168,8 @@ func (ty *trieYear) GetPlanTime(cron *Crontab, aftertime time.Time, count uint)
 							}
 
 						}
-					}
 
+					}
 				}
 			}
 		}