diff --git a/aider/coders/base_coder.py b/aider/coders/base_coder.py
index 8d0d6a265..a3cd668fd 100755
--- a/aider/coders/base_coder.py
+++ b/aider/coders/base_coder.py
@@ -2064,5 +2064,6 @@ class Coder:
         if accumulated_output.strip() and self.io.confirm_ask(
             "Add command output to the chat?", allow_never=True
         ):
-            self.io.output("Added ## lines of output to the chat") # TODO
+            num_lines = len(accumulated_output.strip().splitlines())
+            self.io.output(f"Added {num_lines} lines of output to the chat")
             return accumulated_output