diff --git a/README.md b/README.md
index f411459b25e9aa7127338dbbb05e9095f56044a7..0821e86e1fd7d4d1356fd2e9af301a6dfdb681d8 100644
--- a/README.md
+++ b/README.md
@@ -1,17 +1,26 @@
 # nshmp-lib
 
-***nshmp-lib*** is a USGS developed Java library that supports probabilistic seismic hazard (PSHA)
-and related analyses. This project includes all the code required to load, process and query USGS
-National Seismic Hazard Models (NSHMs). *nshmp-lib* is used by command line applications and web
-services found in the [*nshmp-haz*](https://code.usgs.gov/ghsc/nshmp/nshmp-haz) project. See that
-project for running PSHA calculations.
+***nshmp-lib*** is a U.S. Geological Survey ([USGS][1]) developed Java library that supports
+probabilistic seismic hazard (PSHA) and related analyses. This project includes all the code
+required to load, process and query USGS National Seismic Hazard Models (NSHMs). *nshmp-lib* is
+used by command line applications and web services found in the [*nshmp-haz*][2] project. See
+that project for details on running PSHA calculations.
 
-The project uses [Gradle](https://gradle.org/) for building and testing. To run unit tests and
-create a JAR file for use in other projects, run `./gradlew build` from the root of the repository.
+The project uses [Gradle][3] for building and testing. To run unit tests and create a JAR file
+for use in other projects, run `./gradlew build` from the root of the repository.
 (or `./gradlew.bat build` if using Windows).
 
 See also:
 
-* [*nshmp-haz*](https://code.usgs.gov/ghsc/nshmp/nshmp-haz) and related
-  [documentation](https://code.usgs.gov/ghsc/nshmp/nshmp-haz/-/blob/main/docs/README.md)
-* Project [Javadocs](https://earthquake.usgs.gov/nshmp/docs/nshmp-lib/)
+* [*nshmp-haz*][4] and related [documentation][5]
+* Project [Javadocs][6]
+
+DOI: https://doi.org/10.5066/P9DKFJ5V (version [1.0.0][7])
+
+[1]: https://www.usgs.gov
+[2]: https://code.usgs.gov/ghsc/nshmp/nshmp-haz
+[3]: https://gradle.org/
+[4]: https://code.usgs.gov/ghsc/nshmp/nshmp-haz
+[5]: https://code.usgs.gov/ghsc/nshmp/nshmp-haz/-/blob/main/docs/README.md
+[6]: https://earthquake.usgs.gov/nshmp/docs/nshmp-lib/
+[7]: https://code.usgs.gov/ghsc/nshmp/nshmp-lib/-/tags/1.0.0
diff --git a/src/main/java/gov/usgs/earthquake/nshmp/gmm/KuehnEtAl_2020.java b/src/main/java/gov/usgs/earthquake/nshmp/gmm/KuehnEtAl_2020.java
index f41cfce9034beb4469a221fc9f5296c882c72c54..395f455308295b8b5bb5693f7d937a76c9a87a40 100644
--- a/src/main/java/gov/usgs/earthquake/nshmp/gmm/KuehnEtAl_2020.java
+++ b/src/main/java/gov/usgs/earthquake/nshmp/gmm/KuehnEtAl_2020.java
@@ -81,6 +81,9 @@ import gov.usgs.earthquake.nshmp.tree.LogicTree;
  * basin term to exceed that for the Seattle basin. The Python code does not
  * seem to impose this constraint but I may not be seeing it.
  *
+ * * Uncertainty values obtained from:
+ * https://github.com/nikuehn/KBCG20/tree/master/UNCERTAINTY
+ *
  * @author U.S. Geological Survey
  */