diff --git a/README.md b/README.md
index 1d004b8089316795ac4a34b2515042d5c3770dfb..b61e5deb510093d9abc69f818a56fdbe35acdae1 100644
--- a/README.md
+++ b/README.md
@@ -106,3 +106,7 @@ This software is in the public domain because it contains materials that origina
 Although this software program has been used by the U.S. Geological Survey (USGS), no warranty, expressed or implied, is made by the USGS or the U.S. Government as to the accuracy and functioning of the program and related program material nor shall the fact of distribution constitute any such warranty, and no responsibility is assumed by the USGS in connection therewith.
 
 This software is provided "AS IS."
+
+ [
+    ![CC0](http://i.creativecommons.org/p/zero/1.0/88x31.png)
+  ](http://creativecommons.org/publicdomain/zero/1.0/)