diff --git a/aider/coder.py b/aider/coder.py
index d4f41b129..da7be3593 100755
--- a/aider/coder.py
+++ b/aider/coder.py
@@ -131,7 +131,7 @@ class Coder:
             if fname.is_dir():
                 continue
 
-            self.io.tool_output(f"Added {fname} to the chat")
+            self.io.tool_output(f"Added {fname} to the chat.")
 
             fname = fname.resolve()
             self.abs_fnames.add(str(fname))