diff --git a/hui/src/element.rs b/hui/src/element.rs
index ffca9b4..bb5b0a0 100644
--- a/hui/src/element.rs
+++ b/hui/src/element.rs
@@ -1,4 +1,5 @@
-//! element API, built-in elements like `Container`, `Button`, `Text`, etc.
+//! element API and built-in elements like `Container`, `Button`, `Text`, etc.
+
 use std::any::Any;
 use crate::{
   draw::UiDrawCommandList,
@@ -84,6 +85,7 @@ impl ElementList {
   }
 }
 
+/// Extension trait for [`UiElement`] that adds the [`add_child`] and [`add_root`] methods
 pub trait UiElementExt: UiElement {
   /// Add element as a child/nested element.
   fn add_child(self, ui: &mut ElementList);
@@ -96,6 +98,7 @@ impl<T: UiElement + 'static> UiElementExt for T {
   fn add_child(self, ui: &mut ElementList) {
     ui.add(self)
   }
+
   fn add_root(self, ui: &mut UiInstance, max_size: glam::Vec2) {
     ui.add(self, max_size);
   }
diff --git a/hui/src/element/builtin/container.rs b/hui/src/element/builtin/container.rs
index 9cddc37..5c18382 100644
--- a/hui/src/element/builtin/container.rs
+++ b/hui/src/element/builtin/container.rs
@@ -1,3 +1,5 @@
+//! a container element that can hold and layout multiple children elements
+
 use derive_setters::Setters;
 use glam::{Vec2, vec2};
 use crate::{
@@ -14,26 +16,42 @@ use crate::{
 //   pub width: f32,
 // }
 
-///XXX: add Order/Direction::Forward/Reverse or sth?
+//XXX: add Order/Direction::Forward/Reverse or sth?
 //TODO: clip children flag
 //TODO: borders
 //TODO: min/max size
 
+/// A container element that can hold and layout multiple children elements
 #[derive(Setters)]
 #[setters(prefix = "with_")]
 pub struct Container {
+  /// Size of the container
   #[setters(into)]
   pub size: Size2d,
+
+  /// Layout direction (horizontal/vertical)
   pub direction: UiDirection,
+
+  /// Gap between children elements
   pub gap: f32,
+
+  /// Padding inside the container (distance from the edges to the children elements)
   #[setters(into)]
   pub padding: Sides<f32>,
+
+  /// Alignment of the children elements on X and Y axis
   #[setters(into)]
   pub align: Alignment2d,
+
+  /// Background color of the container
   #[setters(into)]
   pub background: RectBackground,
+
+  /// Corner radius of the background rectangle
   #[setters(into)]
   pub corner_radius: Corners<f32>,
+
+  /// List of children elements
   #[setters(skip)]
   pub children: ElementList,
 }
diff --git a/hui/src/element/builtin/progress_bar.rs b/hui/src/element/builtin/progress_bar.rs
index 7d391b2..5c72e17 100644
--- a/hui/src/element/builtin/progress_bar.rs
+++ b/hui/src/element/builtin/progress_bar.rs
@@ -12,13 +12,22 @@ use crate::{
 #[derive(Debug, Clone, Copy, Setters)]
 #[setters(prefix = "with_")]
 pub struct ProgressBar {
+  /// Current progress, should be in the range 0.0..=1.0
   pub value: f32,
+
+  /// Size of the progress bar element
   #[setters(into)]
   pub size: Size2d,
+
+  /// Foreground (bar) color
   #[setters(into)]
   pub foreground: RectBackground,
+
+  /// Background color
   #[setters(into)]
   pub background: RectBackground,
+
+  /// Corner radius of the progress bar
   #[setters(into)]
   pub corner_radius: Corners<f32>,
 }
diff --git a/hui/src/element/builtin/text.rs b/hui/src/element/builtin/text.rs
index fe7d419..51a6d69 100644
--- a/hui/src/element/builtin/text.rs
+++ b/hui/src/element/builtin/text.rs
@@ -1,3 +1,5 @@
+//! simple text element, renders a string of text
+
 use std::borrow::Cow;
 use derive_setters::Setters;
 use glam::{vec2, Vec4};
@@ -17,17 +19,28 @@ use crate::{
 //   Constant(u8),
 // }
 
+/// Simple text element, renders a string of text
 #[derive(Setters)]
 #[setters(prefix = "with_")]
 pub struct Text {
+  /// Text to render
   #[setters(into)]
   pub text: Cow<'static, str>,
+
+  /// Size of the text element
   #[setters(into)]
   pub size: Size2d,
+
+  /// Color of the text
   #[setters(into)]
   pub color: Vec4,
+
+  /// Font to use for rendering the text\
+  /// If set to `None` either currently selected font or the default font will be used
   #[setters(into)]
   pub font: Option<FontHandle>,
+
+  /// Size of the text, in points (these are not pixels)
   pub text_size: u16,
 }
 
diff --git a/hui/src/element/builtin/transformer.rs b/hui/src/element/builtin/transformer.rs
index bff9321..be27a5b 100644
--- a/hui/src/element/builtin/transformer.rs
+++ b/hui/src/element/builtin/transformer.rs
@@ -1,3 +1,5 @@
+//! wrapper that allows applying various transformations to an element, such as translation, rotation, or scaling
+
 use glam::{Affine2, Vec2};
 use crate::{
   draw::UiDrawCommand, element::{MeasureContext, ProcessContext, UiElement}, measure::Response
@@ -8,6 +10,8 @@ pub struct Transformer {
   pub element: Box<dyn UiElement>,
 }
 
+/// Wrapper that allows applying various transformations to an element, such as translation, rotation, or scaling\
+/// Use sparingly, as this is an experimental feature and may not work as expected\
 impl Transformer {
   pub fn new(element: Box<dyn UiElement>) -> Self {
     Self {
@@ -52,16 +56,17 @@ impl UiElement for Transformer {
   }
 }
 
+/// Extension trait for [`UiElement`] that adds the [`transform`] method
 pub trait ElementTransformExt {
-  fn transform(self) -> Transformer;
-}
-
-impl<T: UiElement + 'static> ElementTransformExt for T {
   /// Wrap the element in a [`Transformer`]
   ///
   /// This allows you to apply various transformations to the element, such as translation, rotation, or scaling\
   /// Use sparingly, as this is an experimental feature and may not work as expected\
   /// Transform is applied around the center of the element's bounding box.
+  fn transform(self) -> Transformer;
+}
+
+impl<T: UiElement + 'static> ElementTransformExt for T {
   fn transform(self) -> Transformer {
     Transformer::new(Box::new(self))
   }