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diff --git a/gitbook/.gitbook/assets/RV_relax (1).svg b/gitbook/.gitbook/assets/RV_relax (1).svg
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diff --git a/gitbook/introduction/tutorial.md b/gitbook/introduction/tutorial.md
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@@ -55,17 +55,19 @@ From the RhinoVAULT toolbar, click on or typing `RV_pattern_relax` in the command line will relax or smoothen the `Pattern` using the _force density method_ (FDM). This function uses default force density values of 1 for all edges, unless they have been manually overridden by the user.
-
-
+
### 2c. Update Boundaries
+RhinoVAULT also provides a function for smoothing the Pattern by controlling the `sag` or curvature of each boundary. From the RhinoVAULT toolbar, click or type `RV_pattern_bnoundaries` in the command line, then each boundary will be labeled with a number.
+If the `Pattern` has not been relaxed in the previous step, `RV_pattern_bnoundaries` will add a default sag (depth to span ratio) of 10%. If the `Pattern` has already been relaxed, as in this case, the boundaries will not be automatically updated. The user can iteratively select a boundary, and impose different sag values until a desired geometry of the `Pattern` is obtained.
+
-
-
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***