README: say that this is about dlopen notes too

Author: keszybz

README.md

@@ -1,15 +1,22 @@
-ELF Package Notes Reference Implementation
+ELF Package and Dlopen Notes Reference Implementation
 
 ## Description
 
-This repository provides RPM and DEB packaging tools to generate an ELF note
-that will be linked into compiled binaries (programs and shared libraries) to
-provide metadata about the package for which the binary was compiled.
+This repository provides RPM and DEB packaging tools to generate an
+`.note.package` ELF note that will be linked into compiled binaries (programs
+and shared libraries) to provide metadata about the package for which the
+binary was compiled.
 
 See [Package Metadata for Core Files](https://systemd.io/ELF_PACKAGE_METADATA/)
 for the overview and details.
 
-The new `--package-metadata` option provided by bfd, gold, mold and lld is used.
+The new `--package-metadata` option provided by `bfd`, `gold`, `mold`, and `lld` is used.
+
+It also provides scripts to extract and display `.note.dlopen` ELF notes
+that are used to describe libraries loaded via `dlopen(3)`.
+
+See [`dlopen()` Metadata for ELF Files](https://systemd.io/ELF_PACKAGE_METADATA/)
+for the overview and details.
 
 ## Requirements
 * binutils (>= 2.39)