🐐 Array concat

README.md

@@ -136,6 +136,19 @@ Individual elements can be accessed by index using square brackets. Indexing is
 > I
 ```
 
+Arrays are concatenated with `@`:
+
+```
+DESIGNA x VT [I, II, III] @ [IV, V]
+DIC x
+```
+
+```
+> [I, II, III, IV, V]
+```
+
+Both operands must be arrays — using `@` on non-arrays raises an error.
+
 A sub-array can be extracted with `VSQVE` inside the index brackets. Both bounds are inclusive and 1-based:
 
 ![Array slicing](snippets/array_slice.png)