diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -38,7 +38,13 @@ This ESP32 Arduino/IDF library for HUB75 / HUB75E connector type 64x32 RGB LED 1
 -  **CIE 1931** luminance [correction](https://ledshield.wordpress.com/2012/11/13/led-brightness-to-your-eye-gamma-correction-no/) (aka natural LED dimming)
 -  **Adafruit GFX API** - library could be build with AdafruitGFX, simplified GFX or without GFX API at all
 
-If you wanna ask "*...OK, OK, than what's the price for those features?*" I'll tell you - "[memory](/doc/i2s_memcalc.md), you pay it all by precious MCU's memory for DMA buffer".
+If you wanna ask "*...OK, OK, than what's the price for those features?*" I'll tell you - "[memory](/doc/i2s_memcalc.md), you pay it all by precious MCU's memory for DMA buffer". 
+
+Please use the 'Memory Calculator' to see what is actually achievable with a typical ESP32.
+
+![Memory Calculator](doc/memcalc.jpg)
+
+
 
 ## ESP32 Supported
 This library supports the:
diff --git a/doc/i2s_memcalc.xlsm b/doc/i2s_memcalc.xlsm
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--- a/doc/i2s_memcalc.md
+++ b/doc/memcalc.md
@@ -1,6 +1,6 @@
-### I2S HUB75 Calculator
+### Memory Calculator
 
-I've made this [spreadsheet](i2s_memcalc.xlsm) to estimate all of the main parameters for ESP32-HUB75-MatrixPanel-I2S-DMA lib driving any combination of matrices/chains so that I do not need to reflash it hundreds of times just to check for the debug info about memory.
+I've made this [spreadsheet](memcalc.xlsm) to estimate all of the main parameters for ESP32-HUB75-MatrixPanel-DMA lib driving any combination of matrices/chains so that I do not need to reflash it hundreds of times just to check for the debug info about memory.
 Be sure to enable embedded macro's to allow refresh rate calculations.
 
 ![](i2scalc.png)
@@ -8,7 +8,7 @@ Just fill-in all of the INPUT fields and get the OUTPUTs.
 
 So there are  two main resources used to drive LED matrix
  - Memory
- - I2S clock speed (resulting in available bandwidth to pump pixel color data)
+ - Bus clock speed (resulting in available bandwidth to pump pixel color data)
 
 And there are lot's of hogs for those:
  - matrix resolution (number of pixels)
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