M README.md → README.md

@@ -50,6 +50,7 @@ - `z`: Clear priority of focused task
 - `p`: Sort task by priority
 - `s`: Sort task by date
 - `u`: Clear done tasks (move them to *done.txt*)
+- `?`: Show full help
 
 ## Features
 
@@ -57,12 +58,32 @@ `todo-txt` is a TUI to manage todo list with [todo-txt format rules](https://github.com/todotxt/todo.txt)
 stored in a plain text file.
 
 ### Due date
+
 Additionnaly, it handles due dates as a [custom *key:value* metadata](https://github.com/todotxt/todo.txt?tab=readme-ov-file#additional-file-format-definitions).
 Example:
 
 ```
 (B) Review pull request #123 @work +code due:2025-09-05
 ```
+
+### Reccurring task
+
+`todo-txt` handles reccuring task with flag `freq`.
+Example:
+
+```
+(C) Update servers freq:month due:2025-09-05
+```
+
+On check of this task, it will be duplicated with a new due date (`2025-10-05`).
+If it doesn't have a due date, the next due date is calculated from today's date.
+
+Available frequency values are:
+- `day`, `daily`
+- `week`, `weekly`
+- `month`, `monthly`
+- `quarter`, `quarterly`
+- `year`, `yearly`
 
 ### Clear tasks history
 

M main.go → main.go

@@ -128,6 +128,11 @@ m.tasks[m.cursor].Reopen()
 				} else {
 					m.selected[m.cursor] = struct{}{}
 					m.tasks[m.cursor].Complete()
+
+					recurringTask := handleRecurringTask(m.tasks[m.cursor])
+					if recurringTask.Original != "" {
+						m.tasks.AddTask(recurringTask)
+					}
 				}
 
 				m.SaveTasks()

A scheduling.go

@@ -0,0 +1,70 @@ 
+package main
+
+import (
+	"strings"
+	"time"
+
+	todo "github.com/1set/todotxt"
+)
+
+type Frequency = int
+
+const (
+	Day Frequency = iota
+	Week
+	Month
+	Quarter
+	Year
+)
+
+var frequencyMap = map[string]Frequency{
+	"day":      Day,
+	"daily":    Day,
+	"week":     Week,
+	"weekly":   Week,
+	"month":    Month,
+	"monthly":  Month,
+	"quarter":  Quarter,
+	"quartery": Quarter,
+	"year":     Year,
+	"yearly":   Year,
+}
+
+func handleRecurringTask(task todo.Task) *todo.Task {
+	freqValue := task.AdditionalTags["freq"]
+
+	if freqValue != "" {
+		newTask, _ := todo.ParseTask(task.Original)
+		dueDate := getDueDate(task)
+		frequency := frequencyMap[strings.ToLower(freqValue)]
+		newTask.DueDate = getNextDueDate(dueDate, frequency)
+		return newTask
+	}
+
+	return &todo.Task{}
+}
+
+func getNextDueDate(dueDate time.Time, frequency Frequency) time.Time {
+	switch frequency {
+	case Day:
+		return dueDate.AddDate(0, 0, 1)
+	case Week:
+		return dueDate.AddDate(0, 0, 7)
+	case Month:
+		return dueDate.AddDate(0, 1, 0)
+	case Quarter:
+		return dueDate.AddDate(0, 3, 0)
+	case Year:
+		return dueDate.AddDate(1, 0, 0)
+	default:
+		return dueDate
+	}
+}
+
+func getDueDate(task todo.Task) time.Time {
+	if task.HasDueDate() {
+		return task.DueDate
+	} else {
+		return time.Now()
+	}
+}