diff --git a/excercise2/parsegenome.c b/excercise2/parsegenome.c
index 0383677..4147eac 100644
--- a/excercise2/parsegenome.c
+++ b/excercise2/parsegenome.c
@@ -3,6 +3,13 @@
 
 
 int main ( int argc, char** args ){
+	/*
+	* About this program:
+	* Reads a genome file and checks if its contents is valid.
+	* If the content is invalid the program exits with -1 otherwise the program exits with 0 
+	*/
+	
+
 	if( argc != 2){
 		printf("Program use: ./a.out <filePath> );
 	} else {
@@ -13,10 +20,27 @@ int main ( int argc, char** args ){
 		printf("Argument 1 : %s , Argument 2 : %s \n", args[0], args[1]);
 		
 		FILE* genomeFile = fopen(arg1, 'r' );
-		//TODO: check file 		
+		/*
+		* File specification/requirements
+		* The file must contain:
+		* - 500 lines of 100 character plus the newline character
+		* - each line of 100 character only contains characters A, C, G or T
+		*/
+
+		// PSUEDO Code 
+		// Step 1: Read the amount of bytes 101 characters take.
+		// step 2: for the first 100 characters check if equal to A, C, G or T
+		// step 3: If not okay close file and program exits (-1)
+		// step 4: if okay check if the last byte is a newline
+		// step 5: if not okay close file and program exits (-1)
+		// step 6: if okay close file and program exits (0)
+		
+		
+
 
 
 		fclose (genomeFile);
+		exit(0);
 
 	}