diff --git a/sys/include/hashes/sha256.h b/sys/include/hashes/sha256.h
index 5025f5455ff8870db345b9716b2a65edf6e78cc2..bcc96bf376184864658eae408c73a7290d2f8f6d 100644
--- a/sys/include/hashes/sha256.h
+++ b/sys/include/hashes/sha256.h
@@ -32,7 +32,7 @@
 
 /**
  * @defgroup    sys_hashes_sha256 SHA-256
- * @ingroup     sys_hashes
+ * @ingroup     sys_hashes_unkeyed
  * @brief       Implementation of the SHA-256 hashing function
  * @{
  *