diff --git a/docs/annexes/changelog.md b/docs/annexes/changelog.md
index 06fafdd..b1a078f 100644
--- a/docs/annexes/changelog.md
+++ b/docs/annexes/changelog.md
@@ -2,6 +2,11 @@
 
 For release notes go to [Release Notes](release-notes.md). All the other (smaller) changes are documented here. This includes especially changes in wording and visuals. Improvements in the specification documented in changelog are not changing the functionality or compatibility of SAF. These changes only improve the understandability of SAF documentation.
 
+
+
+## 30.3.2023 Small description update
+   * Extending notes in [StructuralSurfaceMember](../structural-analysis-elements/structuralsurfacemember.md) nad [StructuralSurfaceMemberRegion](../structural-analysis-elements/structuralsurfacememberregion.md)
+   
 ## 27.2.2023 SAF implementation update
    * NextFEM now supports SAF 2.2.0 and two new objects
 
diff --git a/docs/structural-analysis-elements/structuralsurfacemember.md b/docs/structural-analysis-elements/structuralsurfacemember.md
index 1ace8db..be8a20d 100644
--- a/docs/structural-analysis-elements/structuralsurfacemember.md
+++ b/docs/structural-analysis-elements/structuralsurfacemember.md
@@ -47,3 +47,8 @@ The geometry of a 2D member is defined by nodes ([StructuralPointConnection](str
 >![](../.gitbook/assets/14\_structuralsurfacemember3.png)
 >
 >![](../.gitbook/assets/14\_structuralsurfacemember4.png)
+
+
+>The edges of one surface cannot touch nor cross each other. When necessary, create two or more 2D members instead.
+>
+>![](../.gitbook/assets/15_opening-touch.png)
\ No newline at end of file
diff --git a/docs/structural-analysis-elements/structuralsurfacememberopening.md b/docs/structural-analysis-elements/structuralsurfacememberopening.md
index 31d5cc7..845d696 100644
--- a/docs/structural-analysis-elements/structuralsurfacememberopening.md
+++ b/docs/structural-analysis-elements/structuralsurfacememberopening.md
@@ -22,7 +22,7 @@ Instances of StructuralSurfaceMemberOpening describe openings in face members ([
 
 ## Notes
 
->The edges of one opening can't touch nor cross each other. When necessary, create two or more openings instead.
+>The edges of one opening cannot touch nor cross each other. When necessary, create two or more openings instead.
 >
 >![](../.gitbook/assets/15_opening-touch.png)
 
diff --git a/docs/structural-analysis-elements/structuralsurfacememberregion.md b/docs/structural-analysis-elements/structuralsurfacememberregion.md
index 935a081..232b60e 100644
--- a/docs/structural-analysis-elements/structuralsurfacememberregion.md
+++ b/docs/structural-analysis-elements/structuralsurfacememberregion.md
@@ -29,3 +29,7 @@ This object defines particular areas of the [StructuralSurfaceMember](structural
 >```{image} ../.gitbook/assets/16\_structuralsurfacememberregion2.png
 >:width: 1000px
 >```
+
+>The edges of one region cannot touch nor cross each other. When necessary, create two or more 2D regions instead.
+>
+>![](../.gitbook/assets/15_opening-touch.png)
\ No newline at end of file