diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..0bbcc6b
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,19 @@
+zlib License
+
+(C) 2014, 2016, 2017, 2020 Mark Adler
+
+This software is provided 'as-is', without any express or implied
+warranty.  In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not
+   claim that you wrote the original software. If you use this software
+   in a product, an acknowledgment in the product documentation would be
+   appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be
+   misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.
\ No newline at end of file
diff --git a/README.md b/README.md
index 079c9dd..c64d05e 100644
--- a/README.md
+++ b/README.md
@@ -74,6 +74,7 @@ Executables:
 
 Information:
 - README.md -- this file
+- LICENSE -- license text
 - Makefile -- generate and test code for all CRCs in allcrcs-abbrev.txt
 - allcrcs.txt -- all of the CRC definitions, one per line, from Greg Cook's catalogue
 - allcrcs-abbrev.txt -- allcrcs.txt abbreviated