diff --git a/cent b/cent
index f96e715..20cd6b9 100755
--- a/cent
+++ b/cent
@@ -2,8 +2,7 @@
 """
 Usage:
     cent (-h|--help)
-    cent -i FILE
-    cent -c FILE
+    cent (-i|-c) FILE
 
 Options:
     -h --help   Print this help screen
@@ -31,7 +30,10 @@ def main():
     program = parser.parse(tokens)
 
     if isinstance(program, Program):
-        program.eval()
+        if args["-i"]:
+            program.eval()
+        else:
+            raise Exception("Compiler not implemented")
     else:
         raise Exception("Output not of type 'Program'", type(program))