diff --git a/aider/coders/udiff_simple.py b/aider/coders/udiff_simple.py
index e69de29bb..290178ed4 100644
--- a/aider/coders/udiff_simple.py
+++ b/aider/coders/udiff_simple.py
@@ -0,0 +1,16 @@
+from .udiff_coder import UnifiedDiffCoder
+
+
+class UnifiedDiffSimpleCoder(UnifiedDiffCoder):
+    """
+    A coder that uses unified diff format for code modifications.
+    This variant uses a simpler prompt that doesn't mention specific
+    diff rules like using `@@ ... @@` lines or avoiding line numbers.
+    """
+
+    edit_format = "udiff-simple"
+
+    # We can inherit the prompts if they are suitable or override them here
+    # For now, let's assume the base UnifiedDiffPrompts are sufficient
+    # If specific prompts are needed for the "simple" version, they would be defined here.
+    # gpt_prompts = UnifiedDiffSimplePrompts()