diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..09d1b3d
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,26 @@
+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+
+## [Unreleased]
+
+
+## [1.1.0] - 2020-3-9
+### Added
+- Tests for the basic arithmetics and autoMult option
+- Tests for options.functions
+- Preparing input before parsing, enabling parsing when the passed expression has some unimportant groups such as `as{da } ^{13}{/6}` -> `as da   ^{13} /6 `
+- Types "prod", "sqrt" to Node types.
+
+
+### Changed
+- the error message when parsing `\dfhgw`, which is not defined, the parser throw "undefined control sequence dfhgw";
+- Sqrt now is parsed with type = "sqrt" not "function" as before.
+
+### Fix
+
+- `\lef( [expression] \right)`: an error was thrown when we try to parse such an epxression, it considered right as control sequance name
+- Make the argument for BlockParentheses instance of Array
diff --git a/README.md b/README.md
index 82329e3..6eb54a6 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,125 @@
 # math-latex-parser
-A mathematical parser for latex in math mode. We mean by mathematical that, arithmetic operations is considered for example if you pass "1+2", the result would by a (add node "+") with two children nodes of type number.
+A mathematical parser for latex in math mode. We mean by mathematical that, arithmetic operations are considered. For example, if you pass "1+2", the result would by a (add node "+") with two children nodes of type number.
+
+# Install
+
+```
+npm i @scicave/math-latex-parser
+```
+
+# Usage
+
+```js
+const {parse} = require('@scicave/math-latex-parser'); 
+
+console.log(parse('12+3^6x \\frac 1 {5+3}'));
+/*
+  You ge some thing like this
+  Notice: this is just a prototype, the result is more verbose.
+
+  {
+    "name": "+",
+    "type": "operator",
+    "args": [
+      12,
+      {
+        "type": "automult",
+        "args": [
+          {
+            "type": "automult",
+            "args": [
+              {
+                "name": "^",
+                "type": "operator",
+                "args": [
+                  3,
+                  6
+                ]
+              },
+              "x"
+            ]
+          },
+          {
+            "type": "frac",
+            "args": [
+              1,
+              {
+                "name": "+",
+                "type": "operator",
+                "args": [
+                  5,
+                  3
+                ]
+              }
+            ]
+          }
+        ]
+      }
+    ]
+  }
+*/
+```
+
+You can also pass options to the parse function:
+
+```js
+console.log(parse(tex, options));
+```
+
+# Options
+
+## autoMult: boolean
+> Default: `true`
+
+You can parse some thing like this `3^6cd\\sqrt af`, if false, the previous latex expression will throw an error while being parsed.
+
+## singleCharName: boolean
+> Default: `true`
+
+if you want to use `asdas{d  }  _ {asdasd123}` as id for variable of function (see options.functions here below), you have to set options.singleCharName to false.
+
+## functions: string []
+> Default: []
+
+Acceptable values: Array of checkers, which are functions or regex or another checker[].
+
+this is useful in some cases like, `f(x)`, or `f\left(x\right)`, the function id here is `f`, you can use `blablabla` when singleCharName is `false`.
+
+## operatorNames: checker[]
+> Default: [
+        "floor", "ceil", "round", "random", "factorial",
+        "sech", "csch", "coth", "abs", "arsinh", "arcosh",
+        "artanh", "arasinh", "aracosh", "aratanh",
+      ]
+
+Acceptable values: Array of checkers, which are functions or regex or another checker[]
+
+Some expressions such as `\operatorname{floor}` are valid, when one of the checkers processes `floor` and return `true`.
+
+## builtInControlSeq: checker[]
+> Default: [
+      "alpha", "Alpha", "beta", "Beta", "gamma", "Gamma", "pi", "Pi", "varpi", "phi", "Phi",
+      "varphi", "mu", "theta", "vartheta", "epsilon", "varepsilon", "upsilon", "Upsilon",
+      "zeta", "eta", "Lambda", "lambda", "kappa", "omega", "Omega", "psi", "Psi",
+      "chi", "tau", "sigma", "Sigma", "varsigma", "rho", "varrho", "Xi", "xi", "nu",
+      "imath", "jmath", "ell", "Re", "Im", "wp", "Nabla", "infty", "aleph", "beth",
+      "gimel", "comicron", "iota", "delta", "thetasym", "omicron", "Delta", "Epsilon",
+      "Zeta", "Eta", "Theta", "Iota", "Kappa", "Mu", "Nu", "Omicron", "Rho", "Tau", "Chi"
+    ]
+
+Acceptable values: Array of checkers, which are functions or regex or another checker[]
+
+## builtInFunctions: checker[]
+> Default: [
+      "sinh", "cosh", "tanh", 
+      "sin", "cos", "tan", "sec", "csc", "cot",
+      "arcsin", "arccos", "arctan", "arcsec", "arccsc", "arccot",
+      "ln"
+    ]
+
+Acceptable values: Array of checkers, which are functions or regex or another checker[]
+
+
+# License
+
+MIT
diff --git a/package-lock.json b/package-lock.json
index 117eddf..1e2e18d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "@scicave/math-latex-parser",
-  "version": "1.0.1",
+  "version": "1.1.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 2d11bfe..164b30d 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@scicave/math-latex-parser",
-  "version": "1.0.1",
+  "version": "1.1.0",
   "description": "A mathematical parser for latex in math mode. We mean by mathematical that, arithmetic operations is considered for example if you pass \"1+2\", the result would by a (add node \"+\") with two children nodes of type number.",
   "main": "./lib/index.js",
   "repository": {
diff --git a/src/tex.pegjs b/src/tex.pegjs
index c3d2b23..b1e845e 100644
--- a/src/tex.pegjs
+++ b/src/tex.pegjs
@@ -23,7 +23,7 @@
       "Zeta", "Eta", "Theta", "Iota", "Kappa", "Mu", "Nu", "Omicron", "Rho", "Tau", "Chi"
     ],
 
-    builtInFunctions: [ // the same as the rul builtInFuncsTitles
+    builtInFunctions: [
       "sinh", "cosh", "tanh", 
       "sin", "cos", "tan", "sec", "csc", "cot",
       "arcsin", "arccos", "arctan", "arcsec", "arccsc", "arccot",
@@ -327,11 +327,7 @@ factorial = "!"
 //////           //////
 // definitions
 
-builtInFuncsTitles = // the same as builtInFunctions
-  "sinh"      / "cosh"    / "tanh"    / 
-  "sin"       / "cos"     / "tan"     / "sec"     / "csc"     / "cot"     /
-  "arcsin"    / "arccos"  / "arctan"  / "arcsec"  / "arccsc"  / "arccot"  /
-  "ln"
+builtInFuncsTitles = "\\" name:[a-z]i+ !char &{ return check(name.join(''), options.builtInFunctions); }
 
 /// this may be operator, if so, don't consider as specialSymbol 
 specialSymbolsTitles = a:[a-z]i+ &{ return !check(a.join(''), ignoreSpacialSymbols); }