diff --git a/flex-table-card.js b/flex-table-card.js
index c50dc97..21751d0 100644
--- a/flex-table-card.js
+++ b/flex-table-card.js
@@ -98,15 +98,17 @@ class CellFormatters {
 /** flex-table data representation and keeper */
 class DataTable {
     constructor(cfg) {
-        this.cols = cfg.columns;
         this.cfg = cfg;
+        this.sort_by = cfg.sort_by;
 
-        this.col_ids = this.cols.map(col => col.prop || col.attr || col.attr_as_list);
+        // Provide default column name option if not supplied
+        this.cols = cfg.columns.map((col, idx) => {
+            return { name: col.name || `Col${idx}`, ...col }
+            });
 
         this.headers = this.cols.filter(col => !col.hidden).map(
             (col, idx) => new Object({
-                // if no 'col.name' use 'col_ids[idx]' only if there is no col.icon set!
-                name: col.name || ((!col.icon) ? this.col_ids[idx] : ""),
+                name: col.name,
                 icon: col.icon || null
             }));
 
@@ -126,10 +128,10 @@ class DataTable {
     }
 
     get_rows() {
-        // sorting is allowed asc/desc for one column
-        if (this.cfg.sort_by) {
-            let sort_cols = listify(this.cfg.sort_by);
-            
+        // sorting is allowed asc/desc for multiple columns
+        if (this.sort_by) {
+            let sort_cols = listify(this.sort_by);
+
             let sort_conf = sort_cols.map((sort_col) => {
                 let out = { dir: 1, col: sort_col, idx: null };
                 if (["-", "+"].includes(sort_col.slice(-1))) {
@@ -140,7 +142,7 @@ class DataTable {
                 // DEPRECATION CHANGES ALSO TO BE DONE HERE:
                 // determine col-by-idx to be sorted with...
                 out.idx = this.cols.findIndex((col) =>
-                    ["id", "attr", "prop", "attr_as_list", "data"].some(attr =>
+                    ["id", "attr", "prop", "attr_as_list", "data", "name"].some(attr =>
                         attr in col && out.col == col[attr]));
                 return out;
             });
@@ -173,6 +175,15 @@ class DataTable {
 
         return this.rows;
     }
+
+    updateSortBy(idx) {
+        let new_sort = this.headers[idx].name;
+        if (this.sort_by && new_sort === this.sort_by.slice(0, -1)) {
+            this.sort_by = new_sort + (this.sort_by.slice(-1) === "-" ? "+" : "-");
+        } else {
+            this.sort_by = new_sort + "+";
+        }
+    }
 }
 
 /** just for the deprecation warning (spam avoidance) */
@@ -498,6 +509,12 @@ class FlexTableCard extends HTMLElement {
             "th.center":                "text-align: center; ",
             "tr td.right":              "text-align: right; ",
             "th.right":                 "text-align: right; ",
+            ".headerSortDown::after, .headerSortUp::after":
+                                        "content: ''; position: relative; left: 2px; border: 6px solid transparent; ",
+            ".headerSortDown::after":   "top: 12px; border-top-color: var(--primary-text-color); ",
+            ".headerSortUp::after":     "bottom: 12px; border-bottom-color: var(--primary-text-color); ",
+            ".headerSortDown, .headerSortUp":
+                                        "text-decoration: underline; ",
             "tbody tr:nth-child(odd)":  "background-color: var(--table-row-background-color); ",
             "tbody tr:nth-child(even)": "background-color: var(--table-row-alternative-background-color); ",
             "th ha-icon":               "height: 1em; vertical-align: top; "
@@ -523,7 +540,7 @@ class FlexTableCard extends HTMLElement {
 
         // temporary for generated header html stuff
         let my_headers = this.tbl.headers.map((obj, idx) => new Object({
-            th_html_begin: `<th class="${cfg.columns[idx].align || 'left'}">`,
+            th_html_begin: `<th class="${cfg.columns[idx].align || 'left'}" id="${obj.name}">`,
             th_html_end: `${obj.name}</th>`,
             icon_html: ((obj.icon) ? `<ha-icon id='icon' icon='${obj.icon}'></ha-icon>` : "")
         }));
@@ -546,6 +563,28 @@ class FlexTableCard extends HTMLElement {
         card.appendChild(content);
         // append card to _root_ node...
         root.appendChild(card);
+
+        // add sorting click handler to header elements
+        this.tbl.headers.map((obj, idx) => {
+            root.getElementById(obj.name).onclick = (click) => {
+                // remove previous sort by
+                this.tbl.headers.map((obj, idx) => {
+                    root.getElementById(obj.name).classList.remove("headerSortDown");
+                    root.getElementById(obj.name).classList.remove("headerSortUp");
+                });
+                this.tbl.updateSortBy(idx);
+                if (this.tbl.sort_by.indexOf("+") != -1) {
+                    root.getElementById(obj.name).classList.add("headerSortUp");
+                } else {
+                    root.getElementById(obj.name).classList.add("headerSortDown");
+                }
+                this._updateContent(
+                    root.getElementById("flextbl"),
+                    this.tbl.get_rows()
+                );
+            };
+        });
+
         this._config = cfg;
     }