diff --git a/litescope/software/dump/json.py b/litescope/software/dump/json.py
index d83bc72..f98be8f 100644
--- a/litescope/software/dump/json.py
+++ b/litescope/software/dump/json.py
@@ -22,4 +22,4 @@ class JSONDump(Dump):
             json.dump(self.generate_data(), f)
 
     def read(self, filename):
-        raise NotImplementedError("Python files can not (yet) be read, please contribute!")
+        raise NotImplementedError("JSON files can not (yet) be read, please contribute!")