diff --git a/README.md b/README.md
index eb36025..be55539 100644
--- a/README.md
+++ b/README.md
@@ -28,28 +28,39 @@ Implemented and tested on:
 * SERVER - `gcc server.c rs232.c -lwsock32 -Wall -Werror -Wextra -o client`
 
 ## Launch
-#### Server
+### Server
 Server can be launched with 1 or 2 input parameters. The number of parameters determines what mode will be used - manual or automatic mode. 
 
-**port** - 
+**port** - specific number to identify communication processes of server
 
-**config_file** - 
+**config_file** - configuration file with exact name of variables
 
 * Manual mode - server waits for input commands from client, sends them to laser sensor and returns results back to client
-`./server <port>` 
+- `./server <port>` 
 
 * Automatic mode - server loads variables from configuration file *config.txt*, starts measuring and sends results to client continuously.
-`./server <port> [config_file]`
+- `./server <port> [config_file]`
 
-#### Client
+### Client
 Client has to be lauched with 2 input parameters.
 
-**IP address** - 
+**IP address** - IP address of server the client tries to connect
 
-**port** - 
+**port** - port number of server
 
-#### Demo
+### Demo
+No input parameters.
+
+Macros defines multiple variables used in demo program, which demonstrates connection to server in automatic mode and process of resulting data.
+
+```c
+#define IP_ADDRESS "192.168.0.101"	// IP address of server
+#define PORT 32500			// server port number
+#define MAX_VALUE 1265			// upper limit (depends on used units)
+#define MIN_VALUE 1200			// lower limit (depends on used units)
+```
 
 ## References
 [WinLibs GCC](https://winlibs.com)
+
 [RS-232 library](https://www.teuniz.net/RS-232/)