diff --git a/DESCRIPTION b/DESCRIPTION
index 2ec1b7b..a74d67d 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,5 +1,5 @@
 Package: GSVA
-Version: 1.50.3
+Version: 1.50.4
 Title: Gene Set Variation Analysis for Microarray and RNA-Seq Data
 Authors@R: c(person("Robert", "Castelo", role=c("aut", "cre"), email="robert.castelo@upf.edu"),
              person("Justin", "Guinney", role="aut", email="jguinney@gmail.com"),
@@ -22,4 +22,4 @@ BugReports: https://github.com/rcastelo/GSVA/issues
 Encoding: UTF-8
 biocViews: FunctionalGenomics, Microarray, RNASeq, Pathways, GeneSetEnrichment
 Roxygen: list(markdown = TRUE)
-RoxygenNote: 7.2.3
+RoxygenNote: 7.3.1
diff --git a/R/AllClasses.R b/R/AllClasses.R
index 2b8ad4a..d014ea5 100644
--- a/R/AllClasses.R
+++ b/R/AllClasses.R
@@ -6,7 +6,7 @@
 #' Virtual superclass of expression data classes supported by `GSVA`.
 #'
 #' `GSVA` supports expression data matrices in a growing number of containers
-#' and representations.  This class union allows to store any of these in a slot
+#' and representations. This class union allows to store any of these in a slot
 #' of another class as well as defining common methods for all of them.
 #'
 #' @seealso
@@ -17,6 +17,7 @@
 #' [`SingleCellExperiment-class`],
 #' [`HDF5Array`]
 #'
+#' @aliases GsvaExprData
 #' @name GsvaExprData-class
 #' @rdname GsvaExprData-class
 #' @exportClass GsvaExprData
diff --git a/R/gsvaParam.R b/R/gsvaParam.R
index 8817c7d..14f8a8d 100644
--- a/R/gsvaParam.R
+++ b/R/gsvaParam.R
@@ -8,7 +8,8 @@
 #' gene sets, `GSVA` takes four method-specific parameters as described below.
 #'
 #' @param exprData The expression data.  Must be one of the classes
-#' supported by [`GsvaExprData-class`].
+#' supported by [`GsvaExprData-class`].  Type `help(GsvaExprData)` to consult
+#' the available classes.
 #'
 #' @param geneSets The gene sets.  Must be one of the classes supported by
 #' [`GsvaGeneSets-class`].
diff --git a/R/plageParam.R b/R/plageParam.R
index 8f117f3..7edd114 100644
--- a/R/plageParam.R
+++ b/R/plageParam.R
@@ -8,7 +8,8 @@
 #' an expression data set and a collection of gene sets.
 #'
 #' @param exprData The expression data.  Must be one of the classes
-#' supported by [`GsvaExprData-class`].
+#' supported by [`GsvaExprData-class`].  Type `help(GsvaExprData)` to consult
+#' the available classes.
 #'
 #' @param geneSets The gene sets.  Must be one of the classes supported by
 #' [`GsvaGeneSets-class`].
diff --git a/R/ssgseaParam.R b/R/ssgseaParam.R
index 0bf2add..e351ce2 100644
--- a/R/ssgseaParam.R
+++ b/R/ssgseaParam.R
@@ -8,7 +8,8 @@
 #' gene sets, `ssGSEA` takes two method-specific parameters as described below.
 #'
 #' @param exprData The expression data.  Must be one of the classes
-#' supported by [`GsvaExprData-class`].
+#' supported by [`GsvaExprData-class`].  Type `help(GsvaExprData)` to consult
+#' the available classes.
 #'
 #' @param geneSets The gene sets.  Must be one of the classes supported by
 #' [`GsvaGeneSets-class`].
diff --git a/R/zscoreParam.R b/R/zscoreParam.R
index bcd830d..1883e1e 100644
--- a/R/zscoreParam.R
+++ b/R/zscoreParam.R
@@ -9,7 +9,8 @@
 #' sets.
 #'
 #' @param exprData The expression data.  Must be one of the classes
-#' supported by [`GsvaExprData-class`].
+#' supported by [`GsvaExprData-class`].  Type `help(GsvaExprData)` to consult
+#' the available classes.
 #'
 #' @param geneSets The gene sets.  Must be one of the classes supported by
 #' [`GsvaGeneSets-class`].
diff --git a/man/GsvaExprData-class.Rd b/man/GsvaExprData-class.Rd
index 47d51d6..d3c735d 100644
--- a/man/GsvaExprData-class.Rd
+++ b/man/GsvaExprData-class.Rd
@@ -3,13 +3,14 @@
 \docType{class}
 \name{GsvaExprData-class}
 \alias{GsvaExprData-class}
+\alias{GsvaExprData}
 \title{\code{GsvaExprData} class}
 \description{
 Virtual superclass of expression data classes supported by \code{GSVA}.
 }
 \details{
 \code{GSVA} supports expression data matrices in a growing number of containers
-and representations.  This class union allows to store any of these in a slot
+and representations. This class union allows to store any of these in a slot
 of another class as well as defining common methods for all of them.
 }
 \seealso{
diff --git a/man/gsvaParam-class.Rd b/man/gsvaParam-class.Rd
index bb2b691..e11c84f 100644
--- a/man/gsvaParam-class.Rd
+++ b/man/gsvaParam-class.Rd
@@ -21,7 +21,8 @@ gsvaParam(
 }
 \arguments{
 \item{exprData}{The expression data.  Must be one of the classes
-supported by \code{\linkS4class{GsvaExprData}}.}
+supported by \code{\linkS4class{GsvaExprData}}.  Type \code{help(GsvaExprData)} to consult
+the available classes.}
 
 \item{geneSets}{The gene sets.  Must be one of the classes supported by
 \code{\linkS4class{GsvaGeneSets}}.}
diff --git a/man/plageParam-class.Rd b/man/plageParam-class.Rd
index d25695c..40ebee4 100644
--- a/man/plageParam-class.Rd
+++ b/man/plageParam-class.Rd
@@ -17,7 +17,8 @@ plageParam(
 }
 \arguments{
 \item{exprData}{The expression data.  Must be one of the classes
-supported by \code{\linkS4class{GsvaExprData}}.}
+supported by \code{\linkS4class{GsvaExprData}}.  Type \code{help(GsvaExprData)} to consult
+the available classes.}
 
 \item{geneSets}{The gene sets.  Must be one of the classes supported by
 \code{\linkS4class{GsvaGeneSets}}.}
diff --git a/man/ssgseaParam-class.Rd b/man/ssgseaParam-class.Rd
index 7d96497..759a2c9 100644
--- a/man/ssgseaParam-class.Rd
+++ b/man/ssgseaParam-class.Rd
@@ -19,7 +19,8 @@ ssgseaParam(
 }
 \arguments{
 \item{exprData}{The expression data.  Must be one of the classes
-supported by \code{\linkS4class{GsvaExprData}}.}
+supported by \code{\linkS4class{GsvaExprData}}.  Type \code{help(GsvaExprData)} to consult
+the available classes.}
 
 \item{geneSets}{The gene sets.  Must be one of the classes supported by
 \code{\linkS4class{GsvaGeneSets}}.}
diff --git a/man/zscoreParam-class.Rd b/man/zscoreParam-class.Rd
index 46cc3b8..7a2eec3 100644
--- a/man/zscoreParam-class.Rd
+++ b/man/zscoreParam-class.Rd
@@ -17,7 +17,8 @@ zscoreParam(
 }
 \arguments{
 \item{exprData}{The expression data.  Must be one of the classes
-supported by \code{\linkS4class{GsvaExprData}}.}
+supported by \code{\linkS4class{GsvaExprData}}.  Type \code{help(GsvaExprData)} to consult
+the available classes.}
 
 \item{geneSets}{The gene sets.  Must be one of the classes supported by
 \code{\linkS4class{GsvaGeneSets}}.}