diff --git a/genaisrc/specbot.genai.mts b/genaisrc/specbot.genai.mts
index 0f0e2d121..15bb7abcc 100644
--- a/genaisrc/specbot.genai.mts
+++ b/genaisrc/specbot.genai.mts
@@ -10,4 +10,4 @@ const headerFile = env.files[0];
 const cppFile = env.files[1];
 let answer = await invokeLLMClassInvariant(headerFile.content, cppFile.content);
 
-await workspace.writeText(headerFile.filename + ".spec.h", answer);
\ No newline at end of file
+await workspace.writeText(headerFile.filename + ".spec.md", answer);
\ No newline at end of file