diff --git a/Directional-blocks-and-auto-rotate.md b/Directional-blocks-and-auto-rotate.md
index 0dcb5bc..8ea2f3a 100644
--- a/Directional-blocks-and-auto-rotate.md
+++ b/Directional-blocks-and-auto-rotate.md
@@ -39,8 +39,8 @@ These suffixes stand for Northwest, Northeast, Southwest and Southeast.
 ***
 
 #### Slab endings
-* -D
-* -U
+* -D ``` Min (0, 0, 0) : Max (16, 8, 16)```
+* -U ``` Min (0, 8, 0) : Max (16, 16, 16)```
 
 These suffixes stand for Down and Up.