diff --git a/src/calc.rs b/src/calc.rs
index 6b29869..4906d89 100644
--- a/src/calc.rs
+++ b/src/calc.rs
@@ -262,28 +262,28 @@ impl Calculator {
                     'r' => self.angle_mode = CalculatorAngleMode::Radians,
                     'g' => self.angle_mode = CalculatorAngleMode::Grads,
                     '_' => self.display_mode = CalculatorDisplayMode::Default,
-                    ',' => self.display_mode = CalculatorDisplayMode::Separated(','),
-                    ' ' => self.display_mode = CalculatorDisplayMode::Separated(' '),
-                    's' => self.display_mode = CalculatorDisplayMode::Scientific(DEFAULT_PRECISION),
+                    ',' => self.display_mode = CalculatorDisplayMode::Separated{separator: ','},
+                    ' ' => self.display_mode = CalculatorDisplayMode::Separated{separator: ' '},
+                    's' => self.display_mode = CalculatorDisplayMode::Scientific{precision: DEFAULT_PRECISION},
                     'S' => {
                         let precision = self.checked_get(0)? as usize;
                         if precision > MAX_PRECISION {
                             return Err(CalculatorError::PrecisionTooHigh);
                         }
-                        self.display_mode = CalculatorDisplayMode::Scientific(self.pop_usize()?)
+                        self.display_mode = CalculatorDisplayMode::Scientific{precision: self.pop_usize()?}
                     }
                     'e' => {
-                        self.display_mode = CalculatorDisplayMode::Engineering(DEFAULT_PRECISION)
+                        self.display_mode = CalculatorDisplayMode::Engineering{precision: DEFAULT_PRECISION}
                     }
                     'E' => {
                         let precision = self.checked_get(0)? as usize;
                         if precision > MAX_PRECISION {
                             return Err(CalculatorError::PrecisionTooHigh);
                         }
-                        self.display_mode = CalculatorDisplayMode::Engineering(self.pop_usize()?)
+                        self.display_mode = CalculatorDisplayMode::Engineering{precision: self.pop_usize()?}
                     }
-                    'f' => self.display_mode = CalculatorDisplayMode::Fixed(DEFAULT_PRECISION),
-                    'F' => self.display_mode = CalculatorDisplayMode::Fixed(self.pop_usize()?),
+                    'f' => self.display_mode = CalculatorDisplayMode::Fixed{precision: DEFAULT_PRECISION},
+                    'F' => self.display_mode = CalculatorDisplayMode::Fixed{precision: self.pop_usize()?},
                     _ => return Err(CalculatorError::NoSuchSetting(c)),
                 };
                 self.state = CalculatorState::Normal;
diff --git a/src/calc/constants.rs b/src/calc/constants.rs
index 75740ab..40da934 100644
--- a/src/calc/constants.rs
+++ b/src/calc/constants.rs
@@ -73,22 +73,23 @@ impl fmt::Display for CalculatorAngleMode {
 
 #[derive(Clone, Debug, Serialize, Deserialize)]
 #[serde(tag = "display_mode")]
+// Could also have added content="precision"
 pub enum CalculatorDisplayMode {
     Default,
-    Separated(char),
-    Scientific(usize),
-    Engineering(usize),
-    Fixed(usize),
+    Separated { separator:  char },
+    Scientific { precision: usize },
+    Engineering { precision: usize },
+    Fixed { precision: usize },
 }
 
 impl fmt::Display for CalculatorDisplayMode {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         match self {
             CalculatorDisplayMode::Default => write!(f, "DEF"),
-            CalculatorDisplayMode::Separated(c) => write!(f, "SEP({})", c),
-            CalculatorDisplayMode::Scientific(p) => write!(f, "SCI({})", p),
-            CalculatorDisplayMode::Engineering(p) => write!(f, "ENG({})", p),
-            CalculatorDisplayMode::Fixed(p) => write!(f, "FIX({})", p),
+            CalculatorDisplayMode::Separated{separator} => write!(f, "SEP({})", separator),
+            CalculatorDisplayMode::Scientific{precision} => write!(f, "SCI({})", precision),
+            CalculatorDisplayMode::Engineering{precision} => write!(f, "ENG({})", precision),
+            CalculatorDisplayMode::Fixed{precision} => write!(f, "FIX({})", precision),
         }
     }
 }
diff --git a/src/main.rs b/src/main.rs
index 4823d4b..4b8cd94 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -119,16 +119,16 @@ fn main() -> Result<(), Box<dyn Error>> {
                     let content = vec![Spans::from(Span::raw(
                         match app.calculator.get_display_mode() {
                             CalculatorDisplayMode::Default => format!("{:>2}: {}", i, *m),
-                            CalculatorDisplayMode::Separated(c) => {
-                                format!("{:>2}: {}", i, fmt_separated(*m, *c))
+                            CalculatorDisplayMode::Separated{separator} => {
+                                format!("{:>2}: {}", i, fmt_separated(*m, *separator))
                             }
-                            CalculatorDisplayMode::Scientific(precision) => {
+                            CalculatorDisplayMode::Scientific{precision} => {
                                 format!("{:>2}: {}", i, fmt_scientific(*m, *precision))
                             }
-                            CalculatorDisplayMode::Engineering(precision) => {
+                            CalculatorDisplayMode::Engineering{precision} => {
                                 format!("{:>2}: {}", i, fmt_engineering(*m, *precision))
                             }
-                            CalculatorDisplayMode::Fixed(precision) => {
+                            CalculatorDisplayMode::Fixed{precision} => {
                                 format!("{:>2}: {:.precision$}", i, m, precision = precision)
                             }
                         },