diff --git a/Help/markdown/Table_of_Knowledge_Base_Functions.md b/Help/markdown/Table_of_Knowledge_Base_Functions.md
index e360fa8..b882866 100644
--- a/Help/markdown/Table_of_Knowledge_Base_Functions.md
+++ b/Help/markdown/Table_of_Knowledge_Base_Functions.md
@@ -89,8 +89,10 @@ In the table below, a **name** must be a STR, **parent** is a CON, **attr_str**
 | [**renameattr(con, name, new)**](renameattr.md) | **NONE** | Rename con's named attribute to new. |
 | [**movecleft(con)**](movecleft.md) | **NONE** | Move concept before previous sibling. (Moves concept to the left in its list.) |
 | [**movecright(con)**](movecright.md) | **NONE** | Move concept after next sibling. (Moves concept to the right in its list.) |
+| [**moveconcept(con, parent_c)**](moveconcept.md) | **CON** | Move concept, with its subtree, attributes and phrase, to be the last child of *parent_c*. Returns 0, changing nothing, for the root, a move into its own subtree, or a parent that already has a child of that name. **New in 4.2.21** |
 | [**sortchilds(con)**](sortchilds.md) | **NONE** | Sort concept's immediate children alphabetically. |
 | [**sorthier(con)**](sorthier.md) | **NONE** | Sort concept's subhierarchy alphabetically. |
+| [**sortattrs(con)**](sortattrs.md) | **INT** | Sort concept's attributes alphabetically by name. Each attribute keeps its values in order. **New in 4.2.21** |
 | **Phrase and Node Functions** |   |   |
 | [**findphrase(con)**](findphrase.md) | **PHR** | Fetch concept's phrase. |
 | [**sortphrase(con)**](sortphrase.md) | **NONE** | Sort concept's phrase nodes alphabetically. |
diff --git a/Help/markdown/index.md b/Help/markdown/index.md
index 68c4df5..27c2fb6 100644
--- a/Help/markdown/index.md
+++ b/Help/markdown/index.md
@@ -294,11 +294,13 @@ to a topic.
         - **Change**
           - [attrchange](attrchange.md)
           - [movecleft](movecleft.md)
+          - [moveconcept](moveconcept.md)
           - [movecright](movecright.md)
           - [renameattr](renameattr.md)
           - [renamechild](renamechild.md)
           - [renameconcept](renameconcept.md)
           - [replaceval](replaceval.md)
+          - [sortattrs](sortattrs.md)
           - [sortchilds](sortchilds.md)
           - [sorthier](sorthier.md)
         - **Command File**
diff --git a/Help/markdown/moveconcept.md b/Help/markdown/moveconcept.md
new file mode 100644
index 0000000..a427f2f
--- /dev/null
+++ b/Help/markdown/moveconcept.md
@@ -0,0 +1,57 @@
+[← Help Contents](index.md) | [📘 NLP++ Textbook](NLP++_Textbook.md)
+
+# moveconcept
+
+## Purpose
+
+Move a concept, with all its children, attributes and phrase, so that it becomes the last child of another concept.
+
+## Syntax
+
+```
+returnedConcept = moveconcept(aConcept, newParent);
+```
+
+```
+returnedConcept - type: con
+aConcept - type: con
+newParent - type: con
+```
+
+## Returns
+
+The moved concept, or 0 if it was not moved.
+
+## Remarks
+
+The concept is moved, not copied. Everything under it comes along, and variables that already point to it, or to anything under it, still do.
+
+Nothing is changed, and 0 is returned, when:
+
+- *aConcept* is the root of the knowledge base;
+- *newParent* is *aConcept* itself or one of its descendants;
+- *newParent* already has a child with *aConcept*'s name.
+
+Moving a concept within its current parent makes it that parent's last child. To move a concept one place among its siblings, use [movecleft](movecleft.md) or [movecright](movecright.md).
+
+**NEW 4.2.21**
+
+## Example
+
+```
+@CODE
+L("top") = makeconcept(findroot(), "top");
+L("a") = makeconcept(L("top"), "a");
+L("b") = makeconcept(L("a"), "b");
+makeconcept(L("b"), "b1");
+L("c") = makeconcept(L("top"), "c");
+
+moveconcept(L("b"), L("c"));
+"output.txt" << conceptpath(findconcept(L("b"), "b1")) << "\n";
+```
+
+This writes `"concept" "top" "c" "b" "b1"`: `b` and its child `b1` are now under `c`, and `a` has no children.
+
+## See Also
+
+[movecleft](movecleft.md), [movecright](movecright.md), [renameconcept](renameconcept.md), [Knowledge Base Functions](Table_of_Knowledge_Base_Functions.md)
diff --git a/Help/markdown/sortattrs.md b/Help/markdown/sortattrs.md
new file mode 100644
index 0000000..e406ec5
--- /dev/null
+++ b/Help/markdown/sortattrs.md
@@ -0,0 +1,46 @@
+[← Help Contents](index.md) | [📘 NLP++ Textbook](NLP++_Textbook.md)
+
+# sortattrs
+
+## Purpose
+
+Sort a concept's attributes alphabetically by name.
+
+## Syntax
+
+```
+returnedNum = sortattrs(aConcept);
+```
+
+```
+returnedNum - type: int
+aConcept - type: con
+```
+
+## Returns
+
+1 if the sort succeeded, 0 otherwise.
+
+## Remarks
+
+Names are compared the way [sortchilds](sortchilds.md) compares child concepts, so the order ignores case. Each attribute keeps its values in their original order. Only the order in which the attributes are listed changes, so the order [findattrs](findattrs.md) and [nextattr](nextattr.md) walk them in, and the order they are saved in. Looking an attribute up by name gives the same result before and after.
+
+**NEW 4.2.21**
+
+## Example
+
+```
+@CODE
+L("con") = makeconcept(findroot(), "word");
+addstrval(L("con"), "zeta", "z");
+addstrval(L("con"), "alpha", "2");
+addstrval(L("con"), "alpha", "1");
+addstrval(L("con"), "Mid", "m");
+sortattrs(L("con"));
+```
+
+Before sorting, the attributes are listed as `zeta`, `alpha`, `Mid`. After sorting, they are `alpha`, `Mid`, `zeta`, and `alpha` still has the values `2`, `1` in that order.
+
+## See Also
+
+[sortchilds](sortchilds.md), [sorthier](sorthier.md), [findattrs](findattrs.md), [Knowledge Base Functions](Table_of_Knowledge_Base_Functions.md)