diff --git a/gtm b/gtm
index 98fbb7b..5ef5b36 100755
--- a/gtm
+++ b/gtm
@@ -1501,7 +1501,7 @@ def handle_keyboard_input(key, state: AppState) -> AppState:
 
 # --- Main Application ---
 
-def main(stdscr, filename, show_add, show_del, mouse=True, show_diff=True, wrap_lines=True, show_line_numbers=True):
+def main(stdscr, filename, show_add, show_del, mouse=True, no_diff=False, wrap_lines=True, show_line_numbers=True):
     try:
         curses.curs_set(0)
     except:
@@ -1519,8 +1519,8 @@ def main(stdscr, filename, show_add, show_del, mouse=True, show_diff=True, wrap_
         curses.init_pair(7, 7, -1)                   # Regular line numbers
 
     height, width = stdscr.getmaxyx()
-    # If show_diff is true, enable both additions and deletions
-    if show_diff:
+    # If no_diff is false, enable both additions and deletions
+    if not show_diff:
         show_add = True
         show_del = True
         
@@ -1586,13 +1586,10 @@ def main(stdscr, filename, show_add, show_del, mouse=True, show_diff=True, wrap_
 
 if __name__ == "__main__":
     parser = argparse.ArgumentParser(description="A \"Git Time Machine\" for viewing file history")
-    parser.add_argument("-d", "--diff", action="store_true", help="Highlight newly added and deleted lines")
-    parser.add_argument("--diff-additions", action="store_true", help="Highlight newly added lines in green")
-    parser.add_argument("--diff-deletions", action="store_true", help="Show deleted lines in red")
+    parser.add_argument("--no-diff", action="store_true", help="Don't highlight added and deleted lines")
     parser.add_argument("--no-mouse", action="store_true", help="Disable mouse support")
-    parser.add_argument("--mouse", action="store_true", help="Enable mouse support (default)")
     parser.add_argument("--no-wrap", action="store_true", help="Disable line wrapping")
-    parser.add_argument("--line-numbers", action="store_true", help="Show line numbers")
+    parser.add_argument("--no-numbers", action="store_true", help="Hide line numbers")
     parser.add_argument("-v", "--version", action="store_true", help="Show version number")
     parser.add_argument("filename", nargs="?", help="File to view history for")
     
@@ -1620,5 +1617,15 @@ if __name__ == "__main__":
         sys.exit(1)
         
     # Always enable mouse by default, only disable if --no-mouse is explicitly set
-    mouse_enabled = True if not args.no_mouse else False
-    curses.wrapper(main, filename, args.diff, args.diff_additions, args.diff_deletions, mouse_enabled, not args.no_wrap, args.line_numbers)
+    mouse_enabled = not args.no_mouse
+    
+    # Set diff mode (enabled by default)
+    show_diff = not args.no_diff
+    
+    # Set line numbers (enabled by default)
+    show_line_numbers = not args.no_numbers
+    
+    # Set line wrapping (enabled by default)
+    wrap_lines = not args.no_wrap
+    
+    curses.wrapper(main, filename, show_diff, show_diff, mouse_enabled, args.no_diff, wrap_lines, show_line_numbers)
diff --git a/readme.md b/readme.md
index 50384ef..c6a7a76 100644
--- a/readme.md
+++ b/readme.md
@@ -9,13 +9,10 @@ Basic usage: `gtm [filename]`
 
 ```
 -h, --help        show this help message and exit
--d, --diff        Highlight newly added and deleted lines
---diff-additions  Highlight newly added lines in green
---diff-deletions  Show deleted lines in red
+--no-diff         Don't highlight added and deleted lines
 --no-mouse        Disable mouse support
---mouse           Enable mouse support (default)
 --no-wrap         Disable line wrapping
---line-numbers    Show line numbers
+--no-numbers      Hide line numbers
 -v, --version     Show version number
 ```