diff --git a/README.md b/README.md
index 11a96c1..9c2e336 100644
--- a/README.md
+++ b/README.md
@@ -37,7 +37,7 @@ Server can be launched with 1 or 2 input parameters. The number of parameters de
 
 **port** - specific number to identify communication processes of server
 
-**[config_file]** - configuration file with exact name of variables
+**[config_file]** - configuration file with exact name of variables - check *config.cfg* file as example
 
 #### Manual mode 
 - server waits for input commands from client, sends them to laser sensor and returns results back to client
@@ -48,23 +48,30 @@ Server can be launched with 1 or 2 input parameters. The number of parameters de
 	- `./server <port> [config_file]`
 
 ### Client
-Client has to be lauched with 2 input parameters.
+Client has to be lauched with 2 input parameters. If server is in **manual mode**, the client always loads input commands from *commands.txt*.
 
 **IP address** - IP address of server the client tries to connect
 
 **port** - port number of server
 - `./client <IP address> <port>`
 
-### Demo
+## Demo
+Demo program demonstrates how to create client-like program, which can connect to server in automatic mode and process resulting data.
+#### Building
+UNIX - `gcc demo.c -Wall -Werror -Wextra -o demo`
+
+WINDOWS - `gcc demo.c -Wall -Wextra -lwsock32 -o demo`
+
+#### Launch
 No input parameters.
 
-Macros defines multiple variables used in demo program, which demonstrates connection to server in automatic mode and process of resulting data.
+Macros defines multiple variables:
 
 ```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)
+#define MAX_VALUE 1265			// upper limit to compare (depends on used units)
+#define MIN_VALUE 1200			// lower limit to compare (depends on used units)
 ```
 
 ## References