diff --git a/R/footnote.R b/R/footnote.R
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+#' Add footnote
+#'
+#' @description Add footnote to your favorite kable output. So far this function
+#' only works when you define \code{format} in your kable function or in the
+#' global knitr option \code{knitr.table.format}. In latex, we are using the
+#' \code{threeparttable} package so you need to import this package in your
+#' \code{YAML} header.
+#'
+#' @param input The direct output of your \code{kable} function or your last
+#' \code{kableExtra} function.
+#' @param label A vector of footnotes you want to add. You don't need to add
+#' notations in your notes.
+#' @param notation You can select the format of your footnote notation from
+#' "number", "alphabet" and "symbol".
+#'
+#' @export
+add_footnote <- function(input, label = NULL, notation = "alphabet") {
+  if (is.null(label)){return(input)}
+  # Define available id list
+  if (!notation %in% c("number", "alphabet", "symbol")){
+    warning('Please select your notation within "number", "alphabet" and "symbol". Now add_footnote is using "alphabet" as default.')
+  }
+  if (notation == "symbol") {notation = paste0(notation, ".", attr(input, "format"))}
+  ids.ops <- data.frame(
+    number = as.character(1:20),
+    alphabet = letters[1:20],
+    symbol.latex = c(
+      "*", "\\\\dag", "\\\\ddag", "\\\\S", "\\\\P",
+      "**", "\\\\dag\\\\dag", "\\\\ddag\\\\ddag", "\\\\S\\\\S", "\\\\P\\\\P",
+      "***", "\\\\dag\\\\dag\\\\dag", "\\\\ddag\\\\ddag\\\\ddag", "\\\\S\\\\S\\\\S", "\\\\P\\\\P\\\\P",
+      "****", "\\\\dag\\\\dag\\\\dag\\\\dag", "\\\\ddag\\\\ddag\\\\ddag\\\\ddag", "\\\\S\\\\S\\\\S\\\\S", "\\\\P\\\\P\\\\P\\\\P"
+    ),
+    symbol.html = c(
+      "*", "&dagger;", "&Dagger;", "&sect;", "&para;",
+      "**", "&dagger;&dagger;", "&Dagger;&Dagger;", "&sect;&sect;", "&para;&para;",
+      "*", "&dagger;&dagger;&dagger;", "&Dagger;&Dagger;&Dagger;", "&sect;&sect;&sect;", "&para;&para;&para;",
+      "**", "&dagger;&dagger;&dagger;&dagger;", "&Dagger;&Dagger;&Dagger;&Dagger;", "&sect;&sect;&sect;&sect;", "&para;&para;&para;&para;"
+    )
+  )
+  ids <- ids.ops[,notation]
+
+  if(!attr(input, "format") %in% c("html", "latex")){
+    warning("Currently kableExtra only supports html and latex. You have to specify your kable export format or set it in the global option `knitr.table.format`.")
+    export <- input
+    }
+
+  # Generate latex table footnote using threeparttable --------------------------------
+  if(attr(input, "format")=="latex"){
+    #count the number of items in label and intable notation
+    count.label = length(label)
+    count.intablenoot = sum(gregexpr("\\[note\\]", input)[[1]]>0)
+      if (count.intablenoot != 0 & count.label != count.intablenoot){
+        warning(paste("You entered", count.label, "labels but you put",
+                      count.intablenoot, "[note] in your table."))
+      }
+
+    # generate footer with appropriate symbol
+    footer <- ""
+    for(i in 1:count.label){
+      footer <- paste0(footer,"\\\\item [", ids[i], "] ", label[i], "\n")
+    }
+
+    # Replace in-table notation with appropriate symbol
+    for(i in 1:count.intablenoot){
+      input <- sub("\\[note\\]", paste0("\\\\textsuperscript{", ids[i], "}"), input)
+    }
+
+    #
+    if(grepl("\\\\caption\\{.*?\\}", input)){
+      if(grepl("\\\\begin\\{tabular\\}", input)){
+        export <- sub("\\\\caption\\{", "\\\\begin{threeparttable}\n\\\\caption{", input)
+        }else{export <- input}
+    }else{
+      export <- sub("\\\\begin\\{tabular\\}", "\\\\begin{threeparttable}\n\\\\begin{tabular}", input)
+    }
+    export <- gsub(
+        "\\\\end\\{tabular\\}",
+        paste0(
+          "\\\\end{tabular}\n\\\\begin{tablenotes}\n\\\\small\n",
+          footer, "\\\\end{tablenotes}\n\\\\end{threeparttable}"
+          ),
+        export)
+  }
+  if(attr(input, "format")=="html"){
+
+  }
+  return(export)
+}