diff --git a/README.md b/README.md
index 178fc8b..ab34fee 100644
--- a/README.md
+++ b/README.md
@@ -13,3 +13,9 @@ Documentation is available at:
 
 http://wrf-python.rtfd.org
 
+
+Citation:
+
+    Ladwig, W. (2017). wrf-python (Version x.x.x) [Software]. Boulder, Colorado: UCAR/NCAR. https://doi.org/10.5065/D6W094P1 
+    
+Note: The version number x.x.x should be set to the version of wrf-python that you are using.