doc: Add more details

Author: KSXGitHub

README.md

@@ -15,6 +15,8 @@ Highly parallelized, blazing fast directory tree analyzer.
 
 Both `dust` (v0.5.4) and `dutree` (v0.12.5) do not utilize the parallel computing capability of Rust to improve performance.
 
+Furthermore, when providing multiple file names to `dust`, it shows bars of the exact same length regardless of size differences. This is the final push for the author of `pdu` to create this tool.
+
 ## Benchmark
 
 The benchmark was generated by [a GitHub Workflow](https://github.com/KSXGitHub/parallel-disk-usage/blob/0.2.4/.github/workflows/deploy.yaml#L476-L658) and uploaded to the release page.
@@ -49,6 +51,20 @@ The benchmark was generated by [a GitHub Workflow](https://github.com/KSXGitHub/
 
 [![asciicast of pdu command on /usr](https://asciinema.org/a/416664.svg)](https://asciinema.org/a/416664)
 
+## Features
+
+* Fast.
+* Relative comparison of separate files.
+* Extensible via the library crate or JSON interface.
+* Optional progress report.
+
+## Limitations
+
+* Ignorant of hard links: All hard links are counted as real files regardless of how many times it appear in the tree.
+* Do not follow symbolic links.
+* Do not differentiate filesystem: Mounted folders are counted as normal folders.
+* The runtime is optimized at the expense of binary size.
+
 ## Development
 
 ### Prerequisites