diff --git a/R/InsuranceParameters.R b/R/InsuranceParameters.R
index 42a7aa6606f44df4b30762b6df35a4053fc15ad1..3774deed2ca4ef5ecb86f20c294653e31194a922 100644
--- a/R/InsuranceParameters.R
+++ b/R/InsuranceParameters.R
@@ -52,6 +52,13 @@ setCost = function(costs, type, basis = "SumInsured", frequency = "PolicyPeriod"
 #'
 #' @param costs (optional) existing cost structure to duplicate / use as a starting point
 #' @param alpha Alpha costs (charged once, relative to sum of premiums)
+#' @param alpha.commission Alpha costs (charged during the commission period,
+#'                         relative to sum of premiums; Use the \code{commissionPeriod}
+#'                         and \code{alphaCostsCommission} contract parameters
+#'                         to set the length of the commission period and whether
+#'                         the \code{alpha.commission} val´ue is understood as yearly
+#'                         cost or the sum or present value of the commission
+#'                         charges over the whole commission period)
 #' @param Zillmer Zillmer costs (charged once, relative to sum of premiums)
 #' @param beta Collection costs (charged on each gross premium, relative to gross premium)
 #' @param gamma Administration costs while premiums are paid (relative to sum insured)
diff --git a/man/initializeCosts.Rd b/man/initializeCosts.Rd
index 3e9b4033b791b2d2e75903f1ca3486a2a8222caa..ae23aba2dd933c550787b274c369ddbbfea758f8 100644
--- a/man/initializeCosts.Rd
+++ b/man/initializeCosts.Rd
@@ -27,6 +27,14 @@ initializeCosts(
 
 \item{Zillmer}{Zillmer costs (charged once, relative to sum of premiums)}
 
+\item{alpha.commission}{Alpha costs (charged during the commission period,
+relative to sum of premiums; Use the \code{commissionPeriod}
+and \code{alphaCostsCommission} contract parameters
+to set the length of the commission period and whether
+the \code{alpha.commission} val´ue is understood as yearly
+cost or the sum or present value of the commission
+charges over the whole commission period)}
+
 \item{beta}{Collection costs (charged on each gross premium, relative to gross premium)}
 
 \item{gamma}{Administration costs while premiums are paid (relative to sum insured)}