diff --git a/internal/client.go b/internal/client.go
index 4bd025682..c39382365 100644
--- a/internal/client.go
+++ b/internal/client.go
@@ -467,7 +467,7 @@ type (
 		// Optional: defaulted to 0 seconds
 		JitterStart time.Duration
 
-		// FirstRunAt - Specific time to let the first run of the workflow to start at,
+		// FirstRunAt - Specific time (in RFC 3339 format) to let the first run of the workflow to start at,
 		// This will only be used and override DelayStart and JitterStart if provided in the first run
 		// Optional: defaulted to Unix epoch time
 		FirstRunAt time.Time