diff --git a/CHANGELOG.md b/CHANGELOG.md
index c3fff1e..f4f2706 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+## next - C-C-C-Combo Edition
+* Alert on unknown command
+
 ## 0.3.0 - Extrovert Edition
 * Register new commands from the outside world
 * Added `:tabn`, `:tabp`, `:e`, `:enew`, and a few aliases
diff --git a/lib/ex-state.coffee b/lib/ex-state.coffee
index 40e2632..7aff344 100644
--- a/lib/ex-state.coffee
+++ b/lib/ex-state.coffee
@@ -49,6 +49,7 @@ class ExState
         @history.unshift command
       catch e
         if (e instanceof CommandError)
+          atom.notifications.addError("Command error: #{e.message}")
           @emitter.emit('failed-to-execute')
         else
           throw e