diff --git a/README.md b/README.md
index 3f9129e..b144a73 100644
--- a/README.md
+++ b/README.md
@@ -1,11 +1,17 @@
 # UFO Event Timeline Processing Tool
-Copyright (C) 2023 By Richard Geldreich, Jr.
+
+## Copyrights:
+ufojson tool: Copyright (c) 2023 By Richard Geldreich, Jr. (Apache 2.0 license)
+
+[libsoldout](https://github.com/faelys/libsoldout): Copyright (c) 2009, Natacha Porté (ISC license)
+
+Data files (in 'bin' directory): George M. Eberhart - Copyright 2022, LeRoy Pea - Copyright 9/8/1988 (updated 3/17/2005), Dr. Donald A. Johnson - Copyright 2012, Fred Keziah - Copyright 1958, Dr. Jacques F. Vallée - Copyright 1993
 
 ## Instructions
 
 This C++ command line tool reads several source files containing UFO related events, which were compiled from a variety of sources, and converts each of them to JSON. It then sorts all of these events into a single large timeline and outputs them as Markdown. [pandoc](https://pandoc.org/) can then be used to convert this Markdown text to HTML.
 
-Currently, the tool is Windows only, but it would be trivial to port to Linux/OSX. (I'll do this soon.) To run it: compile the .SLN using Visual Studio 2022. There are no 3rd party dependencies. Run it in the BIN directory. It'll convert all the source files to JSON then output a file named timeline.md. 
+Currently, the tool is Windows only, but it would be trivial to port to Linux/OSX. (I'll do this soon.) To run it: compile the .SLN using Visual Studio 2022. There are no external 3rd party dependencies. Run it in the BIN directory. It'll convert all the source files to JSON then output a file named timeline.md. 
 
 Here's the output [Markdown file converted to PDF](ufo_timeline_v1_04.pdf).