--- a
+++ b/docs/usage/MetCLI.md
@@ -0,0 +1,30 @@
+<h2 id="usage">Command-Line Interface (CLI) Usage
+</h2>
+
+DNAnalyzer uses CLI arguments instead of `stdin`. For example, you can do:
+
+```
+<executable> assets/dna/random/dnalong.fa --amino=ser
+```
+
+or
+
+```
+<executable> assets/dna/random/dnalong.fa --amino=ser --min=0 --max=100
+```
+
+Help message (--help):
+
+```
+Usage: DNAnalyzer [-hrV] --amino=<aminoAcid> [--find=<proteinFile>]
+                  [--max=<maxCount>] [--min=<minCount>] DNA
+A program to analyze DNA sequences.
+      DNA                    The FASTA file to be analyzed.
+      --amino=<aminoAcid>    The amino acid representing the start of a gene.
+      --find=<proteinFile>   The DNA sequence to be found within the FASTA file.
+  -h, --help                 Show this help message and exit.
+      --max=<maxCount>       The maximum count of the reading frame.
+      --min=<minCount>       The minimum count of the reading frame.
+  -r, --reverse              Reverse the DNA sequence before processing.
+  -V, --version              Print version information and exit.
+  ```
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