diff --git a/README.md b/README.md
index f6ece92..3b261a7 100644
--- a/README.md
+++ b/README.md
@@ -21,10 +21,27 @@ $ seq 300 | awk 'BEGIN{OFS="\t"; print "x","sin(x)","cos(x)"}{x=$1/10; print x,s
 
 ## Installation
 
+If you do not have a go enviroment prepared with the corresponding `GOPATH`
+environment variable, you can run these command in Linux:
+
+```bash
+mkdir $HOME/go
+
+echo 'export GOPATH=$HOME/go' >> $HOME/.bashrc
+echo 'export PATH=$PATH:$GOPATH/bin' >> $HOME/.bashrc
+```
+
+Restart the session to have the new environment variables.
+
+With the go environment prepared, you have to run this command in order to
+install termeter:
+
 ```bash
-$ go get github.com/atsaki/termeter/cmd/termeter
+go get github.com/jentrialgo/termeter/cmd/termeter
 ```
 
+The command `termeter` should be in your path.
+
 ## Input Data
 
 You can input data with stdin or file.
@@ -33,13 +50,12 @@ You can input data with stdin or file.
 $ cat data.txt | termeter
 $ termeter data.txt
 ```
-
 termeter can accept tabular data like CSV. 
 Delimiter character can be specified with option '-d DELIMITER'. Default is tab.
 
 ## Chart types
 
-termeter supports following chart types. 
+termeter supports following chart types:
 
 * LINE
   * Plot values as line plot
@@ -49,7 +65,7 @@ termeter supports following chart types.
   * Cumulative distribution function
 
 By default, termeter choose chart type automatically from second line of data.
-If value is numeric LINE is choosed. Otherwise, COUNTER is choosed. 
+If value is numeric LINE is choosed. Otherwise, COUNTER is choosed.
 
 You can specify chart type with option ```-t TYPESTRING```.
 nth character of TYPESTRING corresponds to nth chart type.
@@ -80,6 +96,14 @@ $ tail -f -n +7 dstat.log | termeter -d ,
 
 <a href="https://asciinema.org/a/18129"><img src="https://asciinema.org/a/18129.png" /></a>
 
+## Data labels
+
+You specify which data labels to use as X axis in line charts with the option `-L` and one of these options:
+
+* **count**: use the count of data. (Default)
+* **first**: use the first column, i.e., the first value in the same line.
+* **time**: use current time.
+
 ## License
 
 MIT
diff --git a/cmd/termeter/termeter.go b/cmd/termeter/termeter.go
index 095b53e..7044175 100644
--- a/cmd/termeter/termeter.go
+++ b/cmd/termeter/termeter.go
@@ -135,7 +135,6 @@ func main() {
 
 	if *dataLabelMode == "first" {
 		labels = labels[1:]
-		record = record[1:]
 	}
 
 	types := make([]rune, len(labels), len(labels))