documentation/tutorial.md

@@ -284,6 +284,7 @@ Table 7 - Parametrization of diagonals.
 | `DiagonalShape`                                                        | —      | Cross-section type                                  |
 | `DiagonalSide` / `DiagonalWidth` / `DiagonalHeight` / `DiagonalRadius` | meters | Profile dimensions                                  |
 | `DiagonalEpsilon`                                                      | —      | Small numerical offset to avoid degenerate geometry |
+| `DiagonalGroundGuard`                                                  | meters | Minimum height above ground of the diagonal lower endpoint (0 = ground level) |
 
 ---
 
@@ -355,6 +356,7 @@ Table 9 - Parameter status per structure type.
 | `DiagonalShape` | O | — | — |
 | `DiagonalRadius` / `DiagonalSide` / `DiagonalWidth` / `DiagonalHeight` | O | — | — |
 | `DiagonalEpsilon` | R | — | — |
+| `DiagonalGroundGuard` | R | — | — |
 
 Note: `PoleSide`, `PoleWidth`, `PoleHeight`, `PurlinSide`, etc. are optional in all cases, but
 the relevant dimension parameter must be non-zero when its shape type is selected
@@ -391,6 +393,7 @@ Two poles of different heights support a tilted rafter, with diagonal bracing an
 | `PoleSpacingX` | Total distance between the two poles along X |
 | `RafterLength` | Minimum rafter length (auto-adjusted upward if the tilt geometry requires a longer rafter) |
 | `NumberOfPurlins` | Number of purlins distributed evenly across the rafter span |
+| `DiagonalGroundGuard` | Minimum height above ground of the diagonal lower endpoint (0 = ground level) |
 
 > [!NOTE] If `TiltY` is too large relative to `Height` and `PoleSpacingX`, the structure will extend below ground which 
 > will raise a `ValueError`.