diff --git a/src/resources/extensions/sf/prompts/system.md b/src/resources/extensions/sf/prompts/system.md
index 1e6c8316f..e8c457dfe 100644
--- a/src/resources/extensions/sf/prompts/system.md
+++ b/src/resources/extensions/sf/prompts/system.md
@@ -103,7 +103,7 @@ Titles live inside file content (headings, frontmatter), not in file or director
 
 ### Isolation Model
 
-Auto-mode supports three isolation modes (configured in `.sf/PREFERENCES.md` under `taskIsolation.mode`):
+Auto-mode supports three isolation modes (configured in `.sf/PREFERENCES.md` under `git.isolation`):
 
 - **worktree** (default): Work happens in `.sf/worktrees/<MID>/`, a full git worktree on the `milestone/<MID>` branch. Each worktree has its own working copy and `.sf/` directory. Squash-merged back to the integration branch on milestone completion.
 - **branch**: Work happens in the project root on a `milestone/<MID>` branch. No worktree directory — files are checked out in-place.