diff --git a/lalrpop-util/src/lib.rs b/lalrpop-util/src/lib.rs
index da3f04a..dceff85 100644
--- a/lalrpop-util/src/lib.rs
+++ b/lalrpop-util/src/lib.rs
@@ -143,6 +143,21 @@ pub struct ErrorRecovery<L, T, E> {
     pub dropped_tokens: Vec<(L, T, L)>,
 }
 
+/// Define a module using the generated parse from a `.lalrpop` file.
+///
+/// You have to specify the name of the module and the path of the file
+/// generated by lalrpop. If the input is in the root directory, you can
+/// omit it.
+///
+/// # Example
+/// ```no_run
+/// // load parser in src/parser.lalrpop
+/// lalrpop_mod!(parser);
+///
+/// // load parser in src/lex/parser.lalrpop
+/// lalrpop_mod!(parser, "/lex/parser.rs");
+/// ```
+
 #[macro_export]
 macro_rules! lalrpop_mod {
     ($modname:ident) => { lalrpop_mod!($modname, concat!("/", stringify!($modname), ".rs")); };