diff --git a/extern.cpp b/extern.cpp
index ef20df8..4d8d79f 100644
--- a/extern.cpp
+++ b/extern.cpp
@@ -2,7 +2,7 @@
 using namespace std;
 
 extern int tempVariable;
-
+//extern is used before variable declaration to represent external storage class.
 int main(int argc, char const *argv[]){
 	int tempVariable;
 	cout << "Enter a number : ";
@@ -17,4 +17,4 @@ int main(int argc, char const *argv[]){
 	}
 
 	return 0;
-}
\ No newline at end of file
+}