diff --git a/README.md b/README.md
index dbf4ab0..6741f7d 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,23 @@
 # md2bbc
 
-Markdown to PC's BBcode. Quick n' dirty one.
\ No newline at end of file
+Markdown to PC's BBcode. Quick'n'dirty one.
+
+## Usage
+
+```
+python3 md2bbc.py input.md > output.bbcode
+```
+
+## Features
+
+- `# H1 title`
+- `## H2 title`
+- `### H3 title`
+- `*emphasis text*`
+- `**strong text**`
+- `[link](https://domain.tld)`
+- `{{ tableofcontents }}`
+
+More features may be added in the future, but this script is provided as it.
+Only (very) simple markup will produce correct output.
+Always check BBcode validity before posting.