diff --git a/include/libp2p/basic/scheduler.hpp b/include/libp2p/basic/scheduler.hpp
index e0a96b14..6c753647 100644
--- a/include/libp2p/basic/scheduler.hpp
+++ b/include/libp2p/basic/scheduler.hpp
@@ -94,7 +94,7 @@ namespace libp2p::basic {
      * @param cb callback
      * @param delay_from_now time interval, zero for deferring
      * @param make_handle if true, then active Handle is returned
-     * @return actie or empty Handle, depending on make_handle argument
+     * @return active or empty Handle, depending on make_handle argument
      */
     virtual Handle scheduleImpl(Callback &&cb,
                                 std::chrono::milliseconds delay_from_now,
diff --git a/include/libp2p/common/types.hpp b/include/libp2p/common/types.hpp
index d083f3ba..e10a1c21 100644
--- a/include/libp2p/common/types.hpp
+++ b/include/libp2p/common/types.hpp
@@ -34,7 +34,7 @@ namespace libp2p {
 
   template <class T>
   concept SpanOfBytes = std::is_same_v<std::decay_t<T>, BytesIn>
-                     or std::is_same_v<std::decay_t<T>, BytesIn>;
+                     or std::is_same_v<std::decay_t<T>, BytesOut>;
 
   inline bool operator==(const SpanOfBytes auto &lhs,
                          const SpanOfBytes auto &rhs) {