diff --git a/man/InsuranceContract.ParameterDefaults.Rd b/man/InsuranceContract.ParameterDefaults.Rd
index 925f9700e2fae8d99e42f094b414bfa8e7fe769f..d71f51ffe9c2bd11c43e14d7b53953dd71b95a03 100644
--- a/man/InsuranceContract.ParameterDefaults.Rd
+++ b/man/InsuranceContract.ParameterDefaults.Rd
@@ -110,6 +110,9 @@ those cost components that are defined to be waivable, i.e. by
 defining a corresponding \code{$minCosts}). Linearly interpolates
 between \code{$Costs} and \code{$minCosts}, if the latter is set.
 Otherwise is has no effect.}
+\item{\code{$attributes}}{Additional custom attributes (as a named list),
+which can be used for particular behaviour of different contracts
+or contract slices.}
 }
 }
 
diff --git a/vignettes/using-the-lifeinsurancecontracts-package.Rmd b/vignettes/using-the-lifeinsurancecontracts-package.Rmd
index 78b77aab6c866575a8f6585e341690b7c7699e38..29190d342d7365aab8e0f7361e0617a533a9597f 100644
--- a/vignettes/using-the-lifeinsurancecontracts-package.Rmd
+++ b/vignettes/using-the-lifeinsurancecontracts-package.Rmd
@@ -27,6 +27,7 @@ library(kableExtra)
 library(LifeInsuranceContracts)
 library(dplyr)
 library(tibble)
+library(lubridate)
 options(scipen=5)
 
 library(pander)