diff --git a/DESCRIPTION b/DESCRIPTION
index ff3def4338af703ffda55cd527818ea844937aa5..8d8bddc5fbdf71d11234d5add275b004f45532fc 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,7 +1,7 @@
 Package: stressaddition
 Type: Package
 Title: Modeling Tri-Phasic Concentration-Response Relationships
-Version: 2.0.0
+Version: 2.0.0.9000
 Date: 2020-02-17
 Authors@R: person("Sebastian", "Henz", role = c("aut", "cre"), 
                   email = "sebastian.henz@ufz.de", 
diff --git a/NEWS.md b/NEWS.md
index 76e2ec2ef128af6718962136f839c8ac760bcf9c..22c5af0c2f0954f1d37c7daa13eaea418127bf86 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,3 +1,7 @@
+# stressaddition (development version)
+
+* Fix documentation of `ecxsys()` and `predict_ecxsys`.
+
 # stressaddition 2.0.0
 
 * Changed the order of arguments in `ecxsys()`.