diff --git a/api/include/opentelemetry/common/timestamp.h b/api/include/opentelemetry/common/timestamp.h
index c34045675a..da8765b9bc 100644
--- a/api/include/opentelemetry/common/timestamp.h
+++ b/api/include/opentelemetry/common/timestamp.h
@@ -178,14 +178,14 @@ class DurationUtil
       std::chrono::duration<Rep, Period> timeout,
       std::chrono::duration<Rep, Period> indefinite_value) noexcept
   {
-    // Do not call now() when this duration is max value, now() may have a expemsive cost.
+    // Do not call now() when this duration is max value, now() may have a expensive cost.
     if (timeout == std::chrono::duration<Rep, Period>::max())
     {
       return indefinite_value;
     }
 
     // std::future<T>::wait_for, std::this_thread::sleep_for, and std::condition_variable::wait_for
-    // mey use steady_clock or system_clock.We need make sure now() + timeout do not overflow.
+    // may use steady_clock or system_clock.We need make sure now() + timeout do not overflow.
     auto max_timeout = std::chrono::duration_cast<std::chrono::duration<Rep, Period>>(
         std::chrono::steady_clock::time_point::max() - std::chrono::steady_clock::now());
     if (timeout >= max_timeout)