Update autograder_instructions.md

diff --git a/instructions/autograder_instructions.md b/instructions/autograder_instructions.md
index b3c9e4d2794275d23b260d6f84a894939b479ad0..e9c1bf8bf94c9e0a6d1214eed47d50fc28af5214 100644 (file)
--- a/instructions/autograder_instructions.md
+++ b/instructions/autograder_instructions.md
@@ -98,6 +98,10 @@ Sources.cmake (`kernel/Sources.cmake`, `user/Sources.cmake`, and
 `bootblock/Sources.cmake`).  You are only allowed to modify the lists present in
 those files.
 
+Finally, you **may not** add any autograder generated files (e.g. anything in the `build` directory,
+or any files generated by `cmake` to your git repository.  Doing so will likely cause an autograder
+error, wasting your submission.
+
 Finally, when the autograder runs your code, it will do so in Release mode (with
 the option `-DCMAKE_BUILD_TYPE=Release`).  Ensure your code works in Release
 mode before submitting it to the autograder!