diff --git a/src/lua.rs b/src/lua.rs
index 7b6cf19..3464e60 100644
--- a/src/lua.rs
+++ b/src/lua.rs
@@ -695,6 +695,8 @@ impl Lua {
         }
     }
 
+    /// Evaluate the given expression or statement inside this Lua state, and if it is an
+    /// expression or a statement with return, this returns the value.
     pub fn eval<'lua, R: FromLuaMulti<'lua>>(&'lua self, source: &str) -> LuaResult<R> {
         unsafe {
             stack_guard(self.state, 0, || {