diff --git a/lunduke/auth.py b/lunduke/auth.py
index 7f27467..f1a0567 100644
--- a/lunduke/auth.py
+++ b/lunduke/auth.py
@@ -25,8 +25,10 @@ class DiscourseAuth:
 
     def get_headers(self):
         """Return headers for API requests."""
-        if not self.api_key or not self.username:
-            raise ValueError("API key and username must be set")
+        if not self.api_key:
+            raise ValueError("API Key is not set.")
+        if not self.username:
+            raise ValueError("API sername is not set.")
 
         return {
             "api_key": self.api_key,