diff --git a/src/chart_manager.rs b/src/chart_manager.rs
index c3f4832..e2ffb31 100644
--- a/src/chart_manager.rs
+++ b/src/chart_manager.rs
@@ -1,10 +1,10 @@
 use crate::misc::{add_asterisks, Function};
 
 pub enum UpdateType {
-    FULL,
-    FRONT,
-    BACK,
-    NONE,
+    Full,
+    Front,
+    Back,
+    None,
 }
 
 // Manages Chart generation and caching of values
@@ -69,13 +69,13 @@ impl ChartManager {
         self.resolution = resolution;
 
         if update_back && update_front {
-            UpdateType::FULL
+            UpdateType::Full
         } else if update_back {
-            UpdateType::BACK
+            UpdateType::Back
         } else if update_front {
-            UpdateType::FRONT
+            UpdateType::Front
         } else {
-            UpdateType::NONE
+            UpdateType::None
         }
     }
 
diff --git a/src/egui_app.rs b/src/egui_app.rs
index bbb426d..f99ff68 100644
--- a/src/egui_app.rs
+++ b/src/egui_app.rs
@@ -139,12 +139,12 @@ impl epi::App for MathApp {
             let do_update = chart_manager.update(func_str.clone(), *min_x, *max_x, *num_interval, *resolution);
 
             match do_update {
-                UpdateType::FULL => {
+                UpdateType::Full => {
                     back_cache.invalidate();
                     front_cache.invalidate();
                 }
-                UpdateType::BACK => back_cache.invalidate(),
-                UpdateType::FRONT => front_cache.invalidate(),
+                UpdateType::Back => back_cache.invalidate(),
+                UpdateType::Front => front_cache.invalidate(),
                 _ => {}
             }
         }
diff --git a/src/misc.rs b/src/misc.rs
index bc4e445..efa9fe7 100644
--- a/src/misc.rs
+++ b/src/misc.rs
@@ -57,9 +57,7 @@ pub fn add_asterisks(function_in: String) -> String {
                 add_asterisk = true;
             }
         } else if letters.contains(&c) {
-            if numbers.contains(&prev_char) {
-                add_asterisk = true;
-            } else if valid_variables.contains(&prev_char) && valid_variables.contains(&c) {
+            if numbers.contains(&prev_char) | (valid_variables.contains(&prev_char) && valid_variables.contains(&c)) {
                 add_asterisk = true;
             }
         } else if (numbers.contains(&c) | c_letters_var) && prev_letters_var {