diff --git a/kindlecomicconverter/comic2ebook.py b/kindlecomicconverter/comic2ebook.py
index fbda837..2699f25 100755
--- a/kindlecomicconverter/comic2ebook.py
+++ b/kindlecomicconverter/comic2ebook.py
@@ -650,7 +650,7 @@ def imgDirectoryProcessing(path):
             raise RuntimeError("One of workers crashed. Cause: " + workerOutput[0][0], workerOutput[0][1])
     else:
         rmtree(os.path.join(path, '..', '..'), True)
-        raise UserWarning("Source directory is empty.")
+        raise UserWarning("C2E: Source directory is empty.")
 
 
 def imgFileProcessingTick(output):
diff --git a/kindlecomicconverter/comic2panel.py b/kindlecomicconverter/comic2panel.py
index 4012195..be216cf 100644
--- a/kindlecomicconverter/comic2panel.py
+++ b/kindlecomicconverter/comic2panel.py
@@ -286,7 +286,7 @@ def main(argv=None, qtgui=None):
                         move(targetDir, sourceDir)
                 else:
                     rmtree(targetDir, True)
-                    raise UserWarning("Source directory is empty.")
+                    raise UserWarning("C2P: Source directory is empty.")
             else:
                 raise UserWarning("Provided input is not a directory.")
     else: