diff --git a/R/pkg/R/functions.R b/R/pkg/R/functions.R
index 369b1d00d9e5..ceedbe76711b 100644
--- a/R/pkg/R/functions.R
+++ b/R/pkg/R/functions.R
@@ -444,7 +444,8 @@ setMethod("cosh",
 
 #' Returns the number of items in a group
 #'
-#' Returns the number of items in a group. This is a column aggregate function.
+#' This can be used as a column aggregate function with \code{Column} as input,
+#' and returns the number of items in a group.
 #'
 #' @rdname count
 #' @name count
diff --git a/R/pkg/R/group.R b/R/pkg/R/group.R
index e3479ef5fa58..17f5283abead 100644
--- a/R/pkg/R/group.R
+++ b/R/pkg/R/group.R
@@ -57,7 +57,7 @@ setMethod("show", "GroupedData",
 
 #' Count
 #'
-#' Count the number of rows for each group.
+#' Count the number of rows for each group when we have \code{GroupedData} input.
 #' The resulting SparkDataFrame will also contain the grouping columns.
 #'
 #' @return A SparkDataFrame.
diff --git a/R/pkg/R/sparkR.R b/R/pkg/R/sparkR.R
index de53b0bf79b5..15afe01c24ed 100644
--- a/R/pkg/R/sparkR.R
+++ b/R/pkg/R/sparkR.R
@@ -314,8 +314,10 @@ sparkRHive.init <- function(jsc = NULL) {
 
 #' Get the existing SparkSession or initialize a new SparkSession.
 #'
-#' Additional Spark properties can be set (...), and these named parameters take priority over
-#' over values in master, appName, named lists of sparkConfig.
+#' SparkSession is the entry point into SparkR. \code{sparkR.session} gets the existing
+#' SparkSession or initializes a new SparkSession.
+#' Additional Spark properties can be set in \code{...}, and these named parameters take priority
+#' over values in \code{master}, \code{appName}, named lists of \code{sparkConfig}.
 #'
 #' For details on how to initialize and use SparkR, refer to SparkR programming guide at
 #' \url{http://spark.apache.org/docs/latest/sparkr.html#starting-up-sparksession}.