diff --git a/aheui/option.py b/aheui/option.py
index ed214e5..676dec0 100644
--- a/aheui/option.py
+++ b/aheui/option.py
@@ -14,13 +14,13 @@
 \t1: Quickly resolve deadcode by rough stacksize emulation and merge constant operations.
 \t2: Perfectly resolve deadcode by stacksize emulation, reserialize code chunks and merge constant operations.
 """)
-parser.add_argument('--source', '-S', default='auto', choices='auto,bytecode,asm,asm+comment,text', description='Set source filetype.', full_description="""\t- `auto`: Guess the source type. `bytecode` if `.aheuic` or `End of bytecode` pattern in source. `asm` is `.aheuis`. `text` if `.aheui`. `text` is default.
+parser.add_argument('--source', '-S', default='auto', choices='auto,bytecode,asm,text', description='Set source filetype.', full_description="""\t- `auto`: Guess the source type. `bytecode` if `.aheuic` or `End of bytecode` pattern in source. `asm` is `.aheuis`. `text` if `.aheui`. `text` is default.
 \t- `bytecode`: Aheui bytecode. (Bytecode representation of `ahsembly`.
 \t- `asm`: See `ahsembly`.
 \t- `asm+comment`: Same as `asm` with comments.
 \t- usage: `--source=asm`, `-Sbytecode` or `-S text`
 """)
-parser.add_argument('--target', '-T', default='run', choices='run,bytecode,asm', description='Set target filetype.', full_description="""\t- `run`: Run given code.
+parser.add_argument('--target', '-T', default='run', choices='run,bytecode,asm,asm+comment', description='Set target filetype.', full_description="""\t- `run`: Run given code.
 \t- `bytecode`: Aheui bytecode. (Bytecode representation of `ahsembly`.
 \t- `asm`: See `ahsembly`.
 \t- usage: `--target=asm`, `-Tbytecode` or `-T run`
@@ -131,10 +131,11 @@ def open_r(filename):
                 output += '.aheuic'
         elif target in ['asm', 'asm+comment']:
             output = filename
-            if output.endswith('.aheui'):
-                output += 's'
-            else:
-                output += '.aheuis'
+            if output != '-':
+                if output.endswith('.aheui'):
+                    output += 's'
+                else:
+                    output += '.aheuis'
             comment_aheuis = target == 'asm+comment'
         elif target == 'run':
             output = '-'