diff --git a/README.md b/README.md
index a25ec79..22aacb9 100644
--- a/README.md
+++ b/README.md
@@ -32,8 +32,8 @@
 #### Throughput
 ![equation](http://www.sciweavers.org/tex2img.php?eq=%5Cfrac%7B2%2AN%7D%7B3%2AN%2B10%7D%20%2A%20f&bc=White&fc=Black&im=jpg&fs=12&ff=arev&edit=0)
 
-N = input data block size in couple number ranging from 56 to 2396.
-f = frequency in Mhz.
+'N' = input data block size in couple number ranging from 56 to 2396.
+'f' = frequency in Mhz.
 
 For 50 Mhz clock speed and N = 56, throughput equals 31.5 Mbps
 For 50 Mhz clock speed and N = 2396, throughput equals 33.3 Mbps