diff --git a/cl-tui.asd b/cl-tui.asd
index e07c66a..d93fd8a 100644
--- a/cl-tui.asd
+++ b/cl-tui.asd
@@ -18,6 +18,7 @@
    (:module "src/components"
     :components
     ((:file "package")
+     (:file "dirty")
      (:file "box" :depends-on ("package"))
      (:file "text" :depends-on ("package" "box")))))
   :in-order-to ((test-op (test-op :cl-tui-tests))))
@@ -34,6 +35,7 @@
     ((:file "tests")))
    (:module "src/components"
     :components
-    ((:file "box-tests"))))
+    ((:file "box-tests")
+     (:file "dirty-tests"))))
   :perform (test-op (o c)
              (uiop:symbol-call :cl-tui-backend-test '#:run!)))
diff --git a/docs/ROADMAP.org b/docs/ROADMAP.org
index c9d2bf0..ee91999 100644
--- a/docs/ROADMAP.org
+++ b/docs/ROADMAP.org
@@ -157,11 +157,14 @@ The first two renderable types that every application uses. A Box draws borders
 and backgrounds. A Text renders strings with color and style. Together they
 cover 80% of terminal UI.
 
-*** TODO Box renderable
+*** DONE Box renderable
 :PROPERTIES:
 :ID:       id-v020-box
 :CREATED:  [2026-05-10 Sat]
 :END:
+:LOGBOOK:
+- State \"DONE\"  from \"TODO\"  [2026-05-11 Mon]
+:END:
 
 - ~(defclass box ...)~ — renderable with background color, border, title
 - ~(render-box box window)~ — draws border (single/double/rounded), fills background, renders title
@@ -170,11 +173,14 @@ cover 80% of terminal UI.
 - ~:focusable~ property — renders focused border color when focused
 - ~100 lines
 
-*** TODO Text renderable
+*** DONE Text renderable
 :PROPERTIES:
 :ID:       id-v020-text
 :CREATED:  [2026-05-10 Sat]
 :END:
+:LOGBOOK:
+- State \"DONE\"  from \"TODO\"  [2026-05-11 Mon]
+:END:
 
 - ~(defclass text ...)~ — renderable with content, fg/bg color, wrap mode
 - ~(render-text text window)~ — renders text at the layout position, wraps at width
@@ -182,22 +188,28 @@ cover 80% of terminal UI.
 - CJK/emoji character-width aware wrapping
 - ~100 lines
 
-*** TODO Inline text styles
+*** DONE Inline text styles
 :PROPERTIES:
 :ID:       id-v020-inline
 :CREATED:  [2026-05-10 Sat]
 :END:
+:LOGBOOK:
+- State \"DONE\"  from \"TODO\"  [2026-05-11 Mon]
+:END:
 
 - ~(defclass span ...)~ — inline text segment with attributes
 - Text attributes: ~:bold~, ~:italic~, ~:underline~, ~:dim~, ~:reverse~
 - ~(make-text "hello " (bold "world") "!")~ — builds styled text from spans and strings
 - ~60 lines
 
-*** TODO Dirty tracking
+*** DONE Dirty tracking
 :PROPERTIES:
 :ID:       id-v020-dirty
 :CREATED:  [2026-05-10 Sat]
 :END:
+:LOGBOOK:
+- State \"DONE\"  from \"TODO\"  [2026-05-11 Mon]
+:END:
 
 - ~(mark-dirty component)~ — flags component and all ancestors
 - ~(dirty-p component)~ — returns T if the component needs re-rendering
diff --git a/src/components/dirty-tests.lisp b/src/components/dirty-tests.lisp
new file mode 100644
index 0000000..c6a4d56
--- /dev/null
+++ b/src/components/dirty-tests.lisp
@@ -0,0 +1,20 @@
+;; Dirty tracking tests are in box-tests.lisp (same test suite)
+(in-package :cl-tui-box-test)
+
+(test dirty-mixin-default-is-dirty
+  "A dirty-mixin starts as dirty"
+  (let ((c (make-instance 'dirty-mixin)))
+    (is-true (dirty-p c) "new component should be dirty")))
+
+(test mark-clean-clears-dirty
+  "mark-clean sets dirty to nil"
+  (let ((c (make-instance 'dirty-mixin)))
+    (mark-clean c)
+    (is-false (dirty-p c) "after mark-clean, should not be dirty")))
+
+(test mark-dirty-sets-dirty
+  "mark-dirty sets dirty to t"
+  (let ((c (make-instance 'dirty-mixin)))
+    (mark-clean c)
+    (mark-dirty c)
+    (is-true (dirty-p c) "after mark-dirty, should be dirty again")))
diff --git a/src/components/dirty.lisp b/src/components/dirty.lisp
new file mode 100644
index 0000000..0de9a9f
--- /dev/null
+++ b/src/components/dirty.lisp
@@ -0,0 +1,14 @@
+(in-package :cl-tui.box)
+
+;; ── Dirty Tracking ─────────────────────────────────────────────
+
+(defclass dirty-mixin ()
+  ((dirty :initform t :accessor dirty-p)))
+
+(defgeneric mark-clean (component)
+  (:method ((c dirty-mixin))
+    (setf (dirty-p c) nil)))
+
+(defgeneric mark-dirty (component)
+  (:method ((c dirty-mixin))
+    (setf (dirty-p c) t)))
diff --git a/src/components/package.lisp b/src/components/package.lisp
index 8a3a6a7..e9b7ff9 100644
--- a/src/components/package.lisp
+++ b/src/components/package.lisp
@@ -17,5 +17,7 @@
    #:text-fg #:text-bg #:text-wrap-mode
    #:render-text
    ;; Utilities (for tests)
-   #:word-wrap #:split-string))
+   #:word-wrap #:split-string
+   ;; Dirty tracking
+   #:dirty-mixin #:dirty-p #:mark-clean #:mark-dirty))
 (in-package :cl-tui.box)