diff --git a/vision.py b/vision.py
index 3da35a8..9b8dfdc 100644
--- a/vision.py
+++ b/vision.py
@@ -365,13 +365,21 @@ PSA weighs four things. Assess each one separately:
 - CENTERING: the ratio of the border widths on opposing sides. PSA publishes \
 hard tolerances for this, applied to the FRONT (the back is judged far more \
 leniently, 75/25 for a 10 and 90/10 from 9 downwards):
-    55/45 to 60/40 .... allows a 10
+    55/45 ............. allows a 10
     60/40 ............. allows a 9
     65/35 ............. allows an 8
     70/30 ............. allows a 7
     80/20 ............. allows a 6
     85/15 ............. allows a 5 or 4
     90/10 ............. allows a 3 or 2
+  PSA additionally allows a 5% LEEWAY on these front minimums for cards \
+  grading 7 or better — so a 10's 55/45 can stretch toward 60/40, a 9's \
+  60/40 toward 65/35, and so on up to a 7. That leeway is the grader's \
+  discretion and keys off overall eye appeal, not an automatic second \
+  tolerance: a card just past the published line is genuinely borderline \
+  rather than either automatically passing or automatically failing, so \
+  give the range at that boundary rather than a confident single grade. No \
+  leeway applies at 6 or below.
   Both axes are judged and the WORSE one governs, so a card at 52/48 \
   left-to-right but 70/30 top-to-bottom is a 70/30 card and caps at 7.
   When a MEASURED CENTERING block is supplied, use those figures — they are \