diff -r db8299984bfe -r 6a842bd49fea docs/Writerside/topics/hash_key.h.md
--- a/docs/Writerside/topics/hash_key.h.md	Mon Dec 22 15:47:59 2025 +0100
+++ b/docs/Writerside/topics/hash_key.h.md	Mon Dec 22 16:12:20 2025 +0100
@@ -21,6 +21,8 @@
 CxHashKey cx_hash_key_u64(uint64_t x);
 
 int cx_hash_key_cmp(const CxHashKey *left, const CxHashKey *right);
+
+cxstring cx_hash_key_as_string(const CxHashKey *key);
 ``` 
 
 ## Description
@@ -64,6 +66,8 @@
 
 Hash keys are compared with `cx_hash_key_cmp()`.
 
+When you have a key that stores a string, you can retrieve it by using `cx_hash_key_as_string()`.
+
 <seealso>
 <category ref="apidoc">
 <a href="https://ucx.sourceforge.io/api/hash__key_8h.html">hash_key.h</a>