diff --git a/readme.md b/readme.md
new file mode 100644
index 0000000..5f0fc19
--- /dev/null
+++ b/readme.md
@@ -0,0 +1,21 @@
+### text properties layer
+- tp-layer-set (name start end &optional object)
+- tp-layer-push (name start end properties &optional object)
+- tp-layer-delete (name start end &optional object)
+- tp-layer-rotate (start end &optional object)
+- tp-layer-pin (name start end &optional object)
+- tp-layer-define (name properties)
+- tp-layer-group-define (name &rest layers)
+
+### text properties propertize
+- tp-propertize (string properties &optional layer)
+- tp-layer-propertize (string layer)
+- tp-layer-group-propertize (string layer-group)
+
+### text properties search
+- tp-forward (property &optional value predicate not-current)
+- tp-backward (property &optional value predicate not-current)
+- tp-forward-do (function property &optional value predicate not-current)
+- tp-backward-do (function property &optional value predicate not-current)
+- tp-regions-map (function property &optional value predicate collect)
+- tp-strings-map (function property &optional value predicate collect)
diff --git a/tp.el b/tp.el
index 6f4333d..1c7c1aa 100644
--- a/tp.el
+++ b/tp.el
@@ -254,8 +254,8 @@ function 的四个参数分别为:区间开始位置，区间结束位置，顶
               (value (prop-match-value match)))
     (funcall function start end value)))
 
-(defun tp-regions-map
-    (function property &optional value predicate collect)
+(defun tp-regions-map (function property &optional
+                                value predicate collect)
   "对属性匹配的开头和结尾 point 执行 function。collect 为 t 时返回结果列表"
   (save-excursion
     (goto-char (point-min))
@@ -268,8 +268,8 @@ function 的四个参数分别为:区间开始位置，区间结束位置，顶
         (cl-incf idx 1))
       (nreverse lst))))
 
-(defun tp-strings-map
-    (function property &optional value predicate collect)
+(defun tp-strings-map (function property &optional
+                                value predicate collect)
   "对属性匹配的字符串执行 function"
   (tp-regions-map
    (lambda (start end idx)