diff --git a/guides/full-eval.md b/guides/full-eval.md
index b630100..07a82c6 100644
--- a/guides/full-eval.md
+++ b/guides/full-eval.md
@@ -30,6 +30,11 @@ Do not relay agents' reports to the user as they arrive; wait for all of them.
 Produce ONE report, written to `EVALUATION.md` at the repo root (this file is your only
 write), then show the user just the Verdict and Priority queue sections.
 
+This path is stable and overwritten in place on each run, so if `EVALUATION.md` is
+committed to version control, a subsequent run produces a reviewable diff of how the
+evaluation changed over time. Whether to commit it is the user's call — don't commit it
+yourself.
+
 EVALUATION.md structure:
 
 ```