diff --git a/doc/Changelog b/doc/Changelog
index 2f4569088..17b683e6e 100644
--- a/doc/Changelog
+++ b/doc/Changelog
@@ -7,6 +7,7 @@
 	  glue.
 	- Fix #1127: error: "memory exhausted" when defining more than 9994
 	  local-zones.
+	- Fix documentation for cache_fill_missing function.
 
 21 August 2024: Wouter
 	- Add cross platform freebsd, openbsd and netbsd to github ci.
diff --git a/services/cache/dns.h b/services/cache/dns.h
index 5cb795b07..1dd537d2b 100644
--- a/services/cache/dns.h
+++ b/services/cache/dns.h
@@ -202,6 +202,7 @@ struct dns_msg* dns_cache_lookup(struct module_env* env,
  * @param qclass: which class to look in.
  * @param region: where to store new dp info.
  * @param dp: delegation point to fill missing entries.
+ * @param flags: rrset flags, or 0.
  * @return false on alloc failure.
  */
 int cache_fill_missing(struct module_env* env, uint16_t qclass,