diff --git a/pre_commit/staged_files_only.py b/pre_commit/staged_files_only.py
index b26892b1..2c33abd7 100644
--- a/pre_commit/staged_files_only.py
+++ b/pre_commit/staged_files_only.py
@@ -53,12 +53,14 @@ def _unstaged_changes_cleared(patch_dir: str) -> Generator[None, None, None]:
     if (
         (sys.platform == 'darwin' or sys.platform == 'win32') and
             os.path.exists('./.git/fsmonitor--daemon.ipc') and
-            cmd_output('git', 'fsmonitor--daemon', 'status')[0] == 0
+            cmd_output_b('git', 'fsmonitor--daemon', 'status')[0] == 0
     ):
         logger.warning(
             'The fsmonitor daemon is running; '
             'a bug in the fsmonitor daemon sometimes causes data loss '
-            'when running with pre-commit.',
+            'when running with pre-commit. '
+            'It’s possible to disable it by running '
+            '`git config core.fsmonitor false`',
         )
 
     tree = cmd_output('git', 'write-tree')[1].strip()