diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..a9afb20
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,18 @@
+# Change Log
+
+## [1.1] - 2018-04-04
+## Added
+- [README.md] lines 37-38: `### Simplified implementation in JavaScript`  
+  `- [linesvar_toJavaScript.tcl](https://gist.github.com/YujiSODE/b4bdf10ab7f6700a55baf7acfb351977) (Yuji SODE, 2018): the MIT License`
+- [README.md] lines 35-36: `### Simplified implementation in Tcl`  
+  `- [linesvar_toTcl.tcl](https://gist.github.com/YujiSODE/a65ccf09027f53eeac0ab5e6455a0e25) (Yuji SODE, 2018): the MIT License`
+- [README.md] line 34: `## 4. Simplified implementation of `linesVar()` function`
+- [README.md] lines 28-32: `## 3. Functions defined by output tcl script file`  
+  `- `lines(x)`: function that returns estimated sample distribution`  
+  `- `linesPDF(x)`: function that returns a value of probability density function estimated from the sample distribution`  
+  `- `linesVar()`: function that returns a random variable following PDF`  
+  `  - `$x`: a numerical value`
+
+## Changed
+- [regLines.tcl] line 44: `#+++ functions defined by output tcl script file +++`
+- [README.md] line 28: `## 5. Library list`
diff --git a/README.md b/README.md
index 442180b..59c3f39 100644
--- a/README.md
+++ b/README.md
@@ -25,5 +25,17 @@ Two expressions are available for linear regressions.
 It requires Tcl/Tk 8.6+.
 - `regLines.tcl`
 
-## 3. Library list
+## 3. Functions defined by output tcl script file
+- `lines(x)`: function that returns estimated sample distribution
+- `linesPDF(x)`: function that returns a value of probability density function estimated from the sample distribution
+- `linesVar()`: function that returns a random variable following PDF
+  - `$x`: a numerical value
+
+## 4. Simplified implementation of `linesVar()` function
+### Simplified implementation in Tcl
+- [linesvar_toTcl.tcl](https://gist.github.com/YujiSODE/a65ccf09027f53eeac0ab5e6455a0e25) (Yuji SODE, 2018): the MIT License
+### Simplified implementation in JavaScript
+- [linesvar_toJavaScript.tcl](https://gist.github.com/YujiSODE/b4bdf10ab7f6700a55baf7acfb351977) (Yuji SODE, 2018): the MIT License
+
+## 5. Library list
 - lSum/lSum.tcl (Yuji SODE, 2018): https://gist.github.com/YujiSODE/1f9a4e2729212691972b196a76ba9bd0
diff --git a/regLines.tcl b/regLines.tcl
index b5ee5a6..60acd54 100644
--- a/regLines.tcl
+++ b/regLines.tcl
@@ -41,7 +41,7 @@
 #   - $X: a numerical list for x-axis
 #   - $Y: a numerical list for y-axis
 #--------------------------------------------------------------------
-#+++ function defined by output tcl script file +++
+#+++ functions defined by output tcl script file +++
 # - lines(x): function that returns estimated sample distribution
 # - linesPDF(x): function that returns a value of probability density function estimated from the sample distribution
 # - linesVar(): function that returns a random variable following PDF