diff --git a/src/ts/main.ts b/src/ts/main.ts
index 52e04aba..ff5cef8a 100755
--- a/src/ts/main.ts
+++ b/src/ts/main.ts
@@ -2,7 +2,7 @@ import {createWaterfallSvg} from "./waterfall/svg-chart"
 import {Har} from "./typing/har.d"
 import * as dom  from "./helpers/dom"
 import HarTransformer from "./transformers/har"
-
+import {ChartOptions} from "./typing/options.d"
 
 function showErrorMsg(msg) {
   alert(msg)
@@ -13,7 +13,10 @@ const outputHolder = document.getElementById("output")
 function renderHar(logData: Har) {
   const data = HarTransformer.transfrom(logData)
   dom.removeAllChildren(outputHolder)
-  outputHolder.appendChild(createWaterfallSvg(data, 23))
+  let options = {
+    rowHeight: 23
+  } as ChartOptions
+  outputHolder.appendChild(createWaterfallSvg(data, options))
 }
 
 function onFileSubmit(evt) {
diff --git a/src/ts/typing/options.d.ts b/src/ts/typing/options.d.ts
new file mode 100644
index 00000000..2b09ad69
--- /dev/null
+++ b/src/ts/typing/options.d.ts
@@ -0,0 +1,4 @@
+export interface ChartOptions {
+  /** Height of every request bar block plus spacer pixel (in px) */
+  rowHeight: number
+}
diff --git a/src/ts/waterfall/svg-chart.ts b/src/ts/waterfall/svg-chart.ts
index aa6f2f23..15fdfec6 100644
--- a/src/ts/waterfall/svg-chart.ts
+++ b/src/ts/waterfall/svg-chart.ts
@@ -1,5 +1,6 @@
 import {WaterfallData} from "../typing/waterfall-data.d"
 import {RectData} from "../typing/rect-data.d"
+import {ChartOptions} from "../typing/options.d"
 import TimeBlock from "../typing/time-block"
 import * as svg from "../helpers/svg"
 import {
@@ -33,12 +34,11 @@ function getSvgHeight(marks: any[], barsToShow: TimeBlock[], diagramHeight: numb
 /**
  * Entry point to start rendering the full waterfall SVG
  * @param {WaterfallData} data  Object containing the setup parameter
-
- * @param {requestBarHeight} number   Height of every request bar block plus spacer pixel
+ * @param {options} ChartOptions   Config options
  * @return {SVGSVGElement}            SVG Element ready to render
  */
-export function createWaterfallSvg(data: WaterfallData, requestBarHeight: number = 23): SVGSVGElement {
-
+export function createWaterfallSvg(data: WaterfallData, options: ChartOptions): SVGSVGElement {
+  let requestBarHeight = options.rowHeight
   //constants
 
   /** Width of bar on left in percentage */