diff --git a/promkit/src/core/text_editor.rs b/promkit/src/core/text_editor.rs
index 61c3b402..acb9ed21 100644
--- a/promkit/src/core/text_editor.rs
+++ b/promkit/src/core/text_editor.rs
@@ -101,7 +101,7 @@ impl TextEditor {
             let pos = self.position();
             self.0
                 .contents_mut()
-                .replace_range(pos..pos + 1, &ch.to_string());
+                .replace_range(pos..pos + 1, ch.to_string());
             self.forward();
         }
     }
diff --git a/promkit/src/preset/checkbox.rs b/promkit/src/preset/checkbox.rs
index ab4c97f7..de4c6851 100644
--- a/promkit/src/preset/checkbox.rs
+++ b/promkit/src/preset/checkbox.rs
@@ -29,7 +29,7 @@ impl Checkbox {
     /// # Arguments
     ///
     /// * `items` - An iterator over items
-    /// that implement the `Display` trait, to be used as options.
+    ///   that implement the `Display` trait, to be used as options.
     pub fn new<T: Display, I: IntoIterator<Item = T>>(items: I) -> Self {
         Self {
             title_state: text::State {
diff --git a/promkit/src/preset/listbox.rs b/promkit/src/preset/listbox.rs
index 4190b4c0..e27f8f79 100644
--- a/promkit/src/preset/listbox.rs
+++ b/promkit/src/preset/listbox.rs
@@ -28,7 +28,7 @@ impl Listbox {
     /// # Arguments
     ///
     /// * `items` - An iterator over items
-    /// that implement the `Display` trait, to be used as options.
+    ///   that implement the `Display` trait, to be used as options.
     pub fn new<T: Display, I: IntoIterator<Item = T>>(items: I) -> Self {
         Self {
             title_state: text::State {
diff --git a/promkit/src/preset/query_selector.rs b/promkit/src/preset/query_selector.rs
index cf5d0c29..a2c679a0 100644
--- a/promkit/src/preset/query_selector.rs
+++ b/promkit/src/preset/query_selector.rs
@@ -37,10 +37,10 @@ impl QuerySelector {
     /// # Arguments
     ///
     /// * `items` - An iterator over items that implement the `Display` trait,
-    /// to be used as options in the list box.
+    ///   to be used as options in the list box.
     /// * `filter` - A function that takes the current input
-    /// from the text editor and the list of items,
-    /// returning a filtered list of items to display.
+    ///   from the text editor and the list of items,
+    ///   returning a filtered list of items to display.
     pub fn new<T, I>(items: I, filter: render::Filter) -> Self
     where
         T: Display,
diff --git a/promkit/src/validate.rs b/promkit/src/validate.rs
index 6f62ba8e..fd84a5c3 100644
--- a/promkit/src/validate.rs
+++ b/promkit/src/validate.rs
@@ -25,11 +25,11 @@ impl<T: ?Sized> ValidatorManager<T> {
     /// # Arguments
     ///
     /// * `validator` - A function that takes a reference
-    /// to an input of type `T` and returns a boolean
-    /// indicating whether the input passes the validation.
+    ///   to an input of type `T` and returns a boolean
+    ///   indicating whether the input passes the validation.
     /// * `error_message_generator` - A function that takes a reference
-    /// to an input of type `T` and returns a `String`
-    /// that describes the validation error.
+    ///   to an input of type `T` and returns a `String`
+    ///   that describes the validation error.
     ///
     /// # Returns
     ///
@@ -47,7 +47,7 @@ impl<T: ?Sized> ValidatorManager<T> {
     /// # Arguments
     ///
     /// * `input` - A reference
-    /// to the input of type `T` to be validated.
+    ///   to the input of type `T` to be validated.
     ///
     /// # Returns
     ///
@@ -63,7 +63,7 @@ impl<T: ?Sized> ValidatorManager<T> {
     /// # Arguments
     ///
     /// * `input` - A reference to the input of type `T`
-    /// for which to generate an error message.
+    ///   for which to generate an error message.
     ///
     /// # Returns
     ///