diff --git a/src/determinist/evaluator.hpp b/src/determinist/evaluator.hpp
index 23a0b881b01ecfedb121aabe489636440e7aa8ec..9b037172248fda6348dfbd352a5236ede5b47c98 100644
--- a/src/determinist/evaluator.hpp
+++ b/src/determinist/evaluator.hpp
@@ -155,7 +155,7 @@ namespace evalhyd
         //     shape: ({1+, ...}, 1)
         // \require quad_obs:
         //     Quadratic errors between observations and mean observation.
-        //     shape: ({1+, ...}, time)
+        //     shape: ({1, ...}, time)
         // \require quad_prd:
         //     Quadratic errors between predictions and mean prediction.
         //     shape: ({1+, ...}, time)