diff -r db8299984bfe -r 6a842bd49fea docs/Writerside/topics/buffer.h.md
--- a/docs/Writerside/topics/buffer.h.md	Mon Dec 22 15:47:59 2025 +0100
+++ b/docs/Writerside/topics/buffer.h.md	Mon Dec 22 16:12:20 2025 +0100
@@ -45,7 +45,7 @@
 	// add headers
 	CxMapIterator iter = cxMapIterator(header);
 	cx_foreach(CxMapEntry*, entry, iter) {
-		cxstring name = cx_strn(entry->key->data, entry->key->len);
+		cxstring name = cx_hash_key_as_string(entry->key);
 		cx_bprintf(&buf, "%" CX_PRIstr ": %s\r\n",
 			CX_SFMT(name), entry->value
 		);