diff --git a/man-roxygen/field_param_classes.R b/man-roxygen/field_param_classes.R
index 0a60261c..43ed09d6 100644
--- a/man-roxygen/field_param_classes.R
+++ b/man-roxygen/field_param_classes.R
@@ -1,4 +1,5 @@
 #' @field param_classes (`character()`)\cr
 #'   Supported parameter classes that the optimizer can optimize.
 #'   Determined based on the `surrogate` and the `acq_optimizer`.
-#'   Subclasses of [paradox::Param].
+#'   This corresponds to the values given by a [paradox::ParamSet]'s
+#'   `$class` field.
diff --git a/man/mlr_optimizers_mbo.Rd b/man/mlr_optimizers_mbo.Rd
index 82e14a09..1d987644 100644
--- a/man/mlr_optimizers_mbo.Rd
+++ b/man/mlr_optimizers_mbo.Rd
@@ -123,7 +123,8 @@ The result assigner.}
 \item{\code{param_classes}}{(\code{character()})\cr
 Supported parameter classes that the optimizer can optimize.
 Determined based on the \code{surrogate} and the \code{acq_optimizer}.
-Subclasses of \link[paradox:Param]{paradox::Param}.}
+This corresponds to the values given by a \link[paradox:ParamSet]{paradox::ParamSet}'s
+\verb{$class} field.}
 
 \item{\code{properties}}{(\code{character()})\cr
 Set of properties of the optimizer.
diff --git a/man/mlr_tuners_mbo.Rd b/man/mlr_tuners_mbo.Rd
index 36e4c887..67ea61da 100644
--- a/man/mlr_tuners_mbo.Rd
+++ b/man/mlr_tuners_mbo.Rd
@@ -79,7 +79,8 @@ The result assigner.}
 \item{\code{param_classes}}{(\code{character()})\cr
 Supported parameter classes that the optimizer can optimize.
 Determined based on the \code{surrogate} and the \code{acq_optimizer}.
-Subclasses of \link[paradox:Param]{paradox::Param}.}
+This corresponds to the values given by a \link[paradox:ParamSet]{paradox::ParamSet}'s
+\verb{$class} field.}
 
 \item{\code{properties}}{(\code{character()})\cr
 Set of properties of the optimizer.