diff --git a/src/main.c b/src/main.c
index 30f3323..32130d8 100644
--- a/src/main.c
+++ b/src/main.c
@@ -11,6 +11,7 @@
 
 #define BUFFER_SIZE 0xffffUL
 #define ENCRYPTION_HEADER_LENGTH 12UL
+#define LOCAL_FILE_HEADER_MAGIC (uint32_t)0x04034b50
 
 uint16_t getUint16(char* buffer) {
   return (uint16_t)buffer[0] | \
@@ -25,7 +26,7 @@ uint32_t getUint32(char* buffer) {
 
 int main(int argc, unsigned char *argv[]) {
   if (argc != 4 && argc != 7) {
-    fprintf(stderr, "Wrong arguments. Usage: patcher-installer <disk_name> <disk_offset> <file_size> [<key0> <key1> <key2>]");
+    fprintf(stderr, "Wrong number of arguments. Usage: patcher-installer <disk_name> <disk_offset> <file_size> [<key0> <key1> <key2>]");
     exit(1);
   }
   //TODO: verify argv and assign it to variables
@@ -38,21 +39,21 @@ int main(int argc, unsigned char *argv[]) {
     uint32_t key0 = atoi(argv[4]);
     uint32_t key1 = atoi(argv[5]);
     uint32_t key2 = atoi(argv[6]);
-    //Initialise decryption (pass decryption keys)
+    //Initialize decryption (pass decryption keys)
     initDecryptor(key0, key1, key2);
   }
 
   //-------------------------------------------------
 
-  //Initialise file reader
+  //Initialize file reader
   initFileReader(archiveName, archiveOffset);
 
   //Skip local file header (30 bytes + additional length)
   char* fileHeader = getBytes(30UL);
   //Check that header is correct
   const uint32_t magic = getUint32(fileHeader);
-  if (magic != (uint32_t)0x04034b50) {
-    fprintf(stderr, "Wrong magic in local file header, expected 0x04034b50 but found %#010x.", magic);
+  if (magic != LOCAL_FILE_HEADER_MAGIC) {
+    fprintf(stderr, "Wrong magic in local file header, expected %#010x but found %#010x.", LOCAL_FILE_HEADER_MAGIC, magic);
     exit(1);
   }
   free(fileHeader);