diff --git a/HISTORY.md b/HISTORY.md
index 47fb0889a..bbe874c9d 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,5 +1,10 @@
 # History
 
+## not yet released, version 5.0.1
+
+- Improved error messaging when converting units. Thanks @gap777.
+
+
 ## 2018-06-16, version 5.0.0
 
 !!! BE CAREFUL: BREAKING CHANGES !!!
diff --git a/package.json b/package.json
index 55e497d58..e11c96984 100644
--- a/package.json
+++ b/package.json
@@ -24,6 +24,7 @@
     "Favian Contreras (https://github.com/BigFav)",
     "Finn Pauls (https://github.com/finnp)",
     "Ganga Christopher (https://github.com/gangachris)",
+    "Gary Passero (https://github.com/gap777)",
     "Harry Sarson (https://github.com/HarrySarson)",
     "Holman Gao (https://github.com/golmansax)",
     "Guillermo Indalecio Fernández (https://github.com/guillermobox)",