diff --git a/GUI-API.md b/GUI-API.md
index f5298c8..14dbe13 100644
--- a/GUI-API.md
+++ b/GUI-API.md
@@ -39,6 +39,7 @@ Let the abundance of text below not frighten you: this documentation has many il
 | [  GUI.brailleCanvas](#guibraillecanvasx-y-width-height-extends-guiobject) |
 | [  GUI.scrollBar](#guiscrollbarx-y-width-height-backgroundcolor-foregroundcolor-minimumvalue-maximumvalue-value-shownvaluecount-onscrollvalueincrement-thinmode-extends-guiobject) |
 | [  GUI.textBox](#guitextboxx-y-width-height-backgroundcolor-textcolor-lines-currentline-horizontaloffset-verticaloffset-autowrap-autoheight-extends-guiobject) |
+| [  GUI.progressIndicator](#guiprogressindicatorx-y-passivecolor-primarycolor-secondarycolor-extends-guiobject) |
 | [Ready-to-use containers](#ready-to-use-containers) |
 | [  GUI.layout](#guilayoutx-y-width-height-columncount-rowcount-extends-guicontainer) |
 | [  GUI.window](#guiwindowx-y-width-height-extends-guicontainer) |
@@ -1576,6 +1577,87 @@ Result:
 
 ![](http://i89.fastpic.ru/big/2017/0402/ad/01cdcf7aec919051f64ac2b7d9daf0ad.png)
 
+### GUI.**progressIndicator**(x, y, passiveColor, primaryColor, secondaryColor) extends GUI.**object**
+| Type | Parameter | Description |
+| ------ | ------ | ------ |
+| *int* | x | Indicator coordinate by x-axis |
+| *int* | y | Indicator coordinate by y-axis |
+| *int* | passiveColor | Initial indicator color in passive state |
+| *int* | primaryColor | Primary indicator color in active state |
+| *int* | secondaryColor | Secondary indicator color in active state|
+
+Progress indicator is a simple widget for giving users information when **something is happening**. It just nicely rolls around it's circle shape.
+
+This object has following properties:
+
+| Type | Property | Description |
+| ------ | ------ | ------ |
+| *boolean* | .**active** | Enables or disables progress indicator **active** state |
+| *function* | :**roll**() | Performs a roll operation when indicator circle will be turned to a next iteration. It's visible only in **active** state |
+
+Example of implementation:
+```lua
+
+local GUI = require("GUI")
+local internet = require("Internet")
+
+------------------------------------------------------------------------------------------
+
+local workspace = GUI.workspace()
+workspace:addChild(GUI.panel(1, 1, workspace.width, workspace.height, 0x1E1E1E))
+
+-- Adding progress indicator to display data downloading
+local progressIndicator = workspace:addChild(GUI.progressIndicator(3, 2, 0x3C3C3C, 0x00B640, 0x99FF80))
+
+-- Adding button that performs internet-request to download *something*
+workspace:addChild(GUI.adaptiveButton(3, 6, 2, 1, 0x2D2D2D, 0xD2D2D2, 0x5A5A5A, 0xE1E1E1, "Download")).onTouch = function()
+	-- Switching indicator to active state
+	progressIndicator.active = true
+	workspace:draw()
+
+	-- Sending a GET-request to download data as string
+	local downloadedData = ""
+	local result, reason = internet.rawRequest(
+		-- Url (will return server IP-address)
+		"http://httpbin.org/ip",
+		-- POST data
+		nil,
+		-- Headers
+		nil,
+		-- Downloaded chunk hanlder
+		function(chunk)
+			downloadedData = downloadedData .. chunk
+			
+			-- Rolling indicator to a next state
+			progressIndicator:roll()
+			workspace:draw()
+		end,
+		-- Count of bytes to download per chunk (2 will simulate slow download)
+		2
+	)
+
+	-- Switching indicator to passive state when download is finished
+	progressIndicator.active = false
+	workspace:draw()
+
+	-- Displaying result on screen if request was successfull
+	if result then
+		GUI.alert("Download complete: " .. downloadedData)
+	end
+end
+
+
+------------------------------------------------------------------------------------------
+
+workspace:draw()
+workspace:start()
+
+```
+
+Result:
+
+![](https://i.imgur.com/JNqzBza.gif)
+
 # Ready-to-use containers
 
 There are various containers listed below that support all features of GUI.**container**, however they have a special functional and methods