diff --git a/Cargo.lock b/Cargo.lock
index 2e1e585..b8bb666 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -52,7 +52,7 @@ dependencies = [
 
 [[package]]
 name = "edhex"
-version = "0.4.0"
+version = "0.4.1"
 dependencies = [
  "ansi_term",
  "clap",
@@ -62,7 +62,7 @@ dependencies = [
 
 [[package]]
 name = "edhex_core"
-version = "0.7.0"
+version = "0.7.1"
 dependencies = [
  "ansi_term",
  "regex",
diff --git a/Cargo.toml b/Cargo.toml
index 5d65ebe..da9f4fd 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "edhex"
-version = "0.4.0"
+version = "0.4.1"
 authors = ["John Baber-Lucero <cargo@frundle.com>"]
 license = "GPL-3.0"
 description = "Hex editor that works vaguely like ed"
@@ -11,6 +11,6 @@ edition = "2018"
 
 [dependencies]
 ansi_term = "0.12.1"
-edhex_core = { path = "../edhex_core", version = "0.7.0" }
+edhex_core = { path = "../edhex_core", version = "0.7.1" }
 regex = "1.4.5"
 clap = "2.27.0"
diff --git a/src/lib.rs b/src/lib.rs
index 1c38598..781792b 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -73,6 +73,7 @@ S           (S)ave state to a file except the bytes you're editing.
 t3d         Print 0x3d lines of con(t)extual bytes after current line [Default 0]
 T3d         Print 0x3d lines of con(T)extual bytes before current line [Default 0]
 u           (u)pdate filename to write to
+U           Toggle (U)nderlining main line
 v           Insert a (v)isual break in the display at the current byte.
             NOTE: This does not insert a byte in the file.  It's just display.
 V           Remove a (V)isual break if one is at the current byte.
@@ -114,7 +115,7 @@ impl Command {
         let re_search_again = Regex::new(r"^ *(?P<direction>[/?]) *$").unwrap();
         let re_search_kill = Regex::new(r"^ */(?P<bytes>[0-9a-fA-F]+)/k *$").unwrap();
         let re_search_insert = Regex::new(r"^ */(?P<bytes>[0-9a-fA-F]+)/i *$").unwrap();
-        let re_single_char_command = Regex::new(r"^ *(?P<command>[hijkmnopqRrsSlLPuvVwx]).*$").unwrap();
+        let re_single_char_command = Regex::new(r"^ *(?P<command>[hijkmnopqRrsSlLPuUvVwx]).*$").unwrap();
         let re_range = Regex::new(r"^ *(?P<begin>[0-9a-fA-F.$]+) *, *(?P<end>[0-9a-fA-F.$]+) *(?P<the_rest>.*) *$").unwrap();
         let re_specified_index = Regex::new(r"^ *(?P<index>[0-9A-Fa-f.$]+) *(?P<the_rest>.*) *$").unwrap();
         let re_offset_index = Regex::new(r"^ *(?P<sign>[-+])(?P<offset>[0-9A-Fa-f]+) *(?P<the_rest>.*) *$").unwrap();
@@ -564,7 +565,7 @@ fn minuses(state:&mut State, num_minuses:usize) -> Result<usize, String> {
     }
     else {
         state.index -= num_minuses;
-        state.print_bytes(true);
+        state.print_bytes();
         Ok(state.index)
     }
 }
@@ -585,7 +586,7 @@ fn pluses(state:&mut State, num_pluses:usize) -> Result<usize, String> {
                 }
                 else {
                     state.index += num_pluses;
-                    state.print_bytes(true);
+                    state.print_bytes();
                     Ok(state.index)
                 }
             },
@@ -826,7 +827,7 @@ pub fn actual_runtime(filename:&str, pipe_mode:bool, color:bool, readonly:bool,
         println!("{}", Color::Yellow.paint("h for help"));
         println!("\n{}", state);
         println!();
-        state.print_bytes(true);
+        state.print_bytes();
     }
 
     // TODO Below here should be a function called main_loop()
@@ -857,7 +858,7 @@ pub fn actual_runtime(filename:&str, pipe_mode:bool, color:bool, readonly:bool,
                     'g' => {
                         match ec::move_to(&mut state, command.range.0) {
                             Ok(_) => {
-                                state.print_bytes(true);
+                                state.print_bytes();
                             },
                             Err(error) => {
                                 println!("? ({})", error);
@@ -934,7 +935,7 @@ pub fn actual_runtime(filename:&str, pipe_mode:bool, color:bool, readonly:bool,
                         let first_byte_to_show_index =
                                 state.index.saturating_sub(width);
                         state.index = first_byte_to_show_index;
-                        state.print_bytes(true);
+                        state.print_bytes();
                     }
 
 
@@ -951,7 +952,7 @@ pub fn actual_runtime(filename:&str, pipe_mode:bool, color:bool, readonly:bool,
                         state.all_bytes.append(&mut right_half);
                         state.index = command.range.0;
                         state.unsaved_changes = true;
-                        state.print_bytes(true);
+                        state.print_bytes();
                     },
 
 
@@ -994,6 +995,17 @@ pub fn actual_runtime(filename:&str, pipe_mode:bool, color:bool, readonly:bool,
                         }
                     },
 
+                    /* Toggle underlining non-context line */
+                    'U' => {
+                        state.prefs.underline_main_line =
+                                if state.prefs.underline_main_line {
+                                    false
+                                }
+                                else {
+                                    true
+                                };
+                    }
+
 
                     /* Insert a break in the display at current byte */
                     'v' => {
@@ -1077,7 +1089,7 @@ pub fn actual_runtime(filename:&str, pipe_mode:bool, color:bool, readonly:bool,
                             continue;
                         };
 
-                        state.print_bytes(true);
+                        state.print_bytes();
                     },
 
                     /* Quit */