diff --git a/pdf_oralia/join.py b/pdf_oralia/join.py
index dcaa5ce..f776132 100644
--- a/pdf_oralia/join.py
+++ b/pdf_oralia/join.py
@@ -10,7 +10,9 @@ def join_excel(src, dest, file_pattern):
     logging.debug(f"Concatenate {filenames}")
     dfs = extract_dfs(filenames)
     joined_df = pd.concat(dfs)
+    logging.debug(f"Writing joined excel to {dest}")
     joined_df.to_excel(dest, index=False)
+    logging.debug(f"with {len(joined_df)} rows")
 
 
 def list_files(src, file_glob):
@@ -20,5 +22,8 @@ def list_files(src, file_glob):
 def extract_dfs(filenames):
     dfs = []
     for filename in filenames:
-        dfs.append(pd.read_excel(filename))
+        logging.debug(f"Extracting {filename}")
+        df = pd.read_excel(filename)
+        logging.debug(f"Found {len(df)} rows")
+        dfs.append(df)
     return dfs