diff --git a/src/builder/code.rs b/src/builder/code.rs
index b76d941..b3cf39f 100644
--- a/src/builder/code.rs
+++ b/src/builder/code.rs
@@ -346,7 +346,7 @@ mod tests {
                 .build()
             .bind();      
 
-        assert_eq!(result.len(), 1);              
+        assert_eq!(result.len(), 1);
     }
 
     #[test]
diff --git a/src/builder/module.rs b/src/builder/module.rs
index c63b5a1..c69d5dd 100644
--- a/src/builder/module.rs
+++ b/src/builder/module.rs
@@ -442,6 +442,22 @@ impl<F> Invoke<elements::DataSegment> for ModuleBuilder<F>
 }
 
 /// Start new module builder
+/// # Examples
+///
+/// ```
+/// use parity_wasm::builder;
+/// 
+/// let module = builder::module()
+///     .function()
+///         .signature().param().i32().build()
+///         .body().build()
+///         .build()
+///     .build();
+///
+/// assert_eq!(module.type_section().expect("type section to exist").types().len(), 1);
+/// assert_eq!(module.function_section().expect("function section to exist").entries().len(), 1);
+/// assert_eq!(module.code_section().expect("code section to exist").bodies().len(), 1);
+/// ```
 pub fn module() -> ModuleBuilder {
     ModuleBuilder::new()
 }