diff -r 9a10af83cfab -r dc886f1a6155 docs/Writerside/topics/map.h.md
--- a/docs/Writerside/topics/map.h.md	Sat Nov 01 19:31:48 2025 +0100
+++ b/docs/Writerside/topics/map.h.md	Sat Nov 01 19:48:50 2025 +0100
@@ -312,6 +312,18 @@
         cx_clone_func clone_func,
         const CxAllocator *clone_allocator,
         void *data);
+
+int cxMapIntersection(CxMap *dst,
+        const CxMap *src, const CxMap *other,
+        cx_clone_func clone_func,
+        const CxAllocator *clone_allocator,
+        void *data);
+
+int cxMapListIntersection(CxMap *dst,
+        const CxMap *src, const CxList *keys,
+        cx_clone_func clone_func,
+        const CxAllocator *clone_allocator,
+        void *data);
 ```
 
 With `cxMapClone()` you can create deep copies of the values in one map and insert them into another map.
@@ -323,6 +335,8 @@
 except that they only clone an element from the source map, when the key is _not_ contained in the
 other map (or list, respectively).
 This is equivalent to computing the set difference for the set of keys.
+Likewise, `cxMapIntersection()` and `cxMapListIntersection()` only clone an element from the source map,
+when the key is contained in _both_ collections.
 
 Refer to the documentation of the [clone-function callback](allocator.h.md#clone-function) to learn how to implement it.