diff --git a/README.md b/README.md
index 34e8de3..6b52b4c 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,4 @@
 # SEMAPHORE
 # PROCESS
+
+a semaphore is a variable or abstract data type used to control access to a common resource by multiple processes in a concurrent system such as a multitasking operating system
\ No newline at end of file
diff --git a/semaphore.c b/semaphore.c
index dd6c655..7246f0c 100644
--- a/semaphore.c
+++ b/semaphore.c
@@ -3,6 +3,7 @@
 #include<sys/ipc.h>
 #include<sys/sem.h>
 #include<error.h>
+//program for semaphore creation
 main()
 {
 	int sid,val,val1;