diff --git a/README.md b/README.md
index 4939ce0f..f3aa9b77 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,18 @@ Tiny Microcontroller Communication Protocol.
 
 This protocol is intended to be used in low-memory systems, like
 microcontrollers (Stellaris, Arduino). It is also can be compiled
-for desktop Linux systems, and it is possible to build it for
+for desktop Linux systems, and it can be built it for
 Windows. All you need is to implement callback for writing and
-reading bytes from physical or logical line. 
+reading bytes from communication line.
 
+2. Resources required
+
+Tiny Protocol has low memory consumption. The only memory needed to work is
+a) Memory for Tiny Protocol state machine (24 bytes for Arduino Nano Atmega368p)
+b) Memory to hold data being sent or received.
+
+Tiny protocol has C-Style API, which is suitable for many low-resource systems.
+Also, Arduino version has C++ API, which requires no additional memory.
+
+On Desktop systems, which supports mutexes and threads, Tiny Protocol API becomes thread-safe,
+allowing sending messages via the same channel from parallel threads.