diff --git a/README.md b/README.md
index c3a131a..a254827 100644
--- a/README.md
+++ b/README.md
@@ -152,7 +152,15 @@ See Quick Start for `count`.
 |-----------|-------|----------------------------------------------------------|
 | count     | c     |  draw a baplot based on the number of occurrences (slow) |
 
-### How to view detailed command line options
+### Can YouPlot detect if a header line is present or not?
+
+No. If your input data contains a header line, you need to specify the `-H` option.
+
+### Is there a way to specify a specific column as the x-axis or y-axis?
+
+Not yet. In principle, YouPlot treats the first column as the X axis and the second column as the Y axis. When working with multiple series, the first row is the X axis, the second row is series 1, the third row is series 2, and so on. If you pass only one column of data for `line` and `bar`, YouPlot will automatically use a sequential number starting from 1 as the X-axis. The　`--fmt xyy`, `--fmt xyxy` and `--fmt yx` options give you a few more choices. See the `youplot <command> --help` for more details.YouPlot has limited functionality, but you can use shell scripts such as awk '{print $2, $1}' to swap lines.
+
+### How to view detailed command line options?
 
 Use `--help` to print command-specific options.