diff --git a/sys/include/ztimer.h b/sys/include/ztimer.h
index 4c4ffb3394964..8cb09ade2b204 100644
--- a/sys/include/ztimer.h
+++ b/sys/include/ztimer.h
@@ -301,12 +301,18 @@ struct ztimer_base {
     uint32_t offset;            /**< offset from last timer in list */
 };
 
+/**
+ * @defgroup    ztimer_now64 using this module changes ztimer_now type, but not for long
+ * @deprecated  use uint32_t or ztimer64, will be removed after 2022.07 release.
+ */
 #if MODULE_ZTIMER_NOW64
 typedef uint64_t ztimer_now_t;  /**< type for ztimer_now() result
-                                 * @deprecated use uint32_t or ztimer64 */
+                                 * @deprecated use uint32_t or ztimer64,
+                                 * will be removed after 2022.07 release. */
 #else
 typedef uint32_t ztimer_now_t;  /**< type for ztimer_now() result
-                                 * @deprecated use uint32_t or ztimer64 */
+                                 * @deprecated use uint32_t or ztimer64,
+                                 * will be removed after 2022.07 release. */
 #endif
 
 /**