diff --git a/R/Cemig.R b/R/Cemig.R
index 539896918e137176a201ec356148efff4f62f620..b750046fa7d041dad657ff3a6eff69beb4c48260 100644
--- a/R/Cemig.R
+++ b/R/Cemig.R
@@ -1,23 +1,29 @@
 #' @name Cemig
 #' @title Ações da CEMIG
-#' @description Dados sobre os preçoes diários das ações da CEMIG, 
+#' @description Dados sobre os preçoes diários das ações da CEMIG,
 #'     de três de Janeiro de 1995 a 27 de Dezembro de 2000.
-#'          
+#'
 #' @format Uma série temporal (classe \code{ts}), com 1498 observações
 #'     diárias, de 3 de janeiro de 1995 a 27 de dezembro de 2000.
 #' @keywords TS
 #' @source Morettin, P. A., Toloi, C. M. C. (2006). Análise de Séries
 #'     Temporais (2nd ed.). São Paulo, SP: Editora Egard
-#'     Blucher. (Série A9 - Mercado Financeiro, mencionada em diversas 
+#'     Blucher. (Série A9 - Mercado Financeiro, mencionada em diversas
 #'     páginas)
 #' @examples
 #'
 #' data(Cemig)
 #' str(Cemig)
+#'
+#' library(zoo)
 #' Cemig
 #'
-#' # Médias anuais
-#' aggregate(Cemig, FUN = mean)
+#' # Médias anuais e em cada mês
+#' aggregate(Cemig, by = format(time(Cemig), "%Y"), FUN = mean)
+#' aggregate(Cemig, by = format(time(Cemig), "%B"), FUN = mean)
+#'
+#' # Série regularmente espaçada com médias mensais
+#' aggregate(Cemig, by = as.yearmon, FUN = mean)
 #'
 #' # Visualização da série
 #' library(lattice)
diff --git a/data-raw/Cemig.txt b/data-raw/Cemig.txt
index cdbd667a56a8b7eb1369c56e6f718b6623ce0c66..f371f853bc37599e6cb20c295f6315ef6de7748a 100644
--- a/data-raw/Cemig.txt
+++ b/data-raw/Cemig.txt
@@ -1,1499 +1,1499 @@
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diff --git a/data/Cemig.rda b/data/Cemig.rda
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