diff --git a/sudoku.c b/sudoku.c
--- a/sudoku.c
+++ b/sudoku.c
@@ -41,6 +41,7 @@
 static unsigned long iterations = 0;
 
 typedef struct Field Field;
+
 typedef Field **Board;
 
 /**
@@ -129,6 +130,7 @@
 int solveBoard (Board board, int k)
 {
     u_int i;
+
     int q;
 
     if ((++iterations > MAX_ITERATIONS))
@@ -181,8 +183,11 @@
 int main (int argc, char **argv)
 {
     Board b;
+
     int i;
+
     int ret;
+
     int colored = 0;
 
     while ((i = getopt (argc, argv, "ch")) != -1) {