diff --git a/README.md b/README.md
index 204645e..d81c543 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,15 @@
 filaswitch
 ==============================
-Filament switch post processor for 3D printing. Currently tested with Prometheus System and Simplify3D.
+Filament switch post processor for Simplify 3D (3.1.1).
+Currently tested with Prometheus System.
+Main features:
+- adds material switch purge tower g-code to Simplify3D dual-extruder prints (Prometheus System supported)
+- fixes S3D ver 3.1.1 bug with 'Perform retraction during wipe movement'
+
+Perform retraction during wipe movement-bug:
+- filaswitch detects if this feature is enabled in S3D profile and applies the fix automatically.
+- also one doesn't need to have Prometheus System to apply this fix. Simply omit the dual-extrusion S3D configuration and filaswitch will skip 
+ dual-extrusion g-code addition
 
 Disclaimer: i'm not responsible if anything bad happens due to use of this script.
 
@@ -13,8 +22,10 @@ Prerequisites
 * 3D Printer with 2 extruders - one nozzle setup
 * Printer profile in S3D configured for dual extrusion
 
+##Use case1:
+Print dual-color model with Prometheus system
 
-### Simplify3D configuration
+### Simplify3D configuration for Prometheus dual-extrusion
 
 * Open process and show advanced settings
 ##### G-code-tab
@@ -39,20 +50,36 @@ Prerequisites
 
 > T[new_tool]
 
-Usage:
---------------------
+###Usage:
 
-First slice your dual-color model in Simplify3D
+First slice your dual-color model in Simplify3D.
+Save g-code to disk.
 
-###Post processing (GUI):
+####Post processing (GUI):
 * Open the GUI, in Windows use filaswitch.bat, in Linux use shell (python3 filaswitch.py)
 * Select your HW configuration; PTFE, E3DV6 or PEEK
 * Click the 'Browse...'to select the g-code file
 * Check info screen
 * Done
 
-###Post processing (cli):
+####Post processing (cli):
 * python3 filaswitch.py /path/tp/yourgcodefile.gcode (Linux) PTFE|E3DV6|PEEK
 * python filaswitch.py \path\to\yourgcodefile.gcode PTFE|E3DV6|PEEK
 
 Result is a new file, with _fs.gcode ending. You're ready to print :).
+
+
+##Use case2:
+Only fix S3D bug with Retract during wipe
+
+First slice your model in Simplify3D, no need to change any settings.
+Save g-code to disk.
+
+####Post processing (GUI):
+* Open the GUI, in Windows use filaswitch.bat, in Linux use shell (python3 filaswitch.py)
+* Select your HW configuration; PTFE, E3DV6 or PEEK (doesn't matter in this case)
+* Click the 'Browse...'to select the g-code file
+* Check info screen
+* Done
+ 
+Result is a new file, with _fs.gcode ending. You're ready to print :).
\ No newline at end of file