From 9a9b93ec3af01e09c9b5c13956eeff32a3de8d68 Mon Sep 17 00:00:00 2001
From: wilmerdooley <wilmerdooley1@gmail.com>
Date: Wed, 10 Jun 2026 21:24:26 +0000
Subject: [PATCH] feat: clarify needed features for examples in
 `nalgebra-sparse`

Signed-off-by: wilmerdooley <wilmerdooley1@gmail.com>
---
 nalgebra-sparse/src/lib.rs | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/nalgebra-sparse/src/lib.rs b/nalgebra-sparse/src/lib.rs
index 11ce08348..e25712215 100644
--- a/nalgebra-sparse/src/lib.rs
+++ b/nalgebra-sparse/src/lib.rs
@@ -77,6 +77,16 @@
 //!
 //! # Example: COO -> CSR -> matrix-vector product
 //!
+//! The example below uses the `matrixcompare` crate to compare sparse and dense matrices. Enable
+//! the `compare` feature for both `nalgebra-sparse` and `nalgebra`:
+//!
+//! ```toml
+//! [dependencies]
+//! nalgebra-sparse = { version = "0.12", features = ["compare"] }
+//! nalgebra = { version = "0.35", features = ["compare"] }
+//! matrixcompare = "0.3"
+//! ```
+//!
 //! ```
 //! use nalgebra_sparse::{coo::CooMatrix, csr::CsrMatrix};
 //! use nalgebra::{DMatrix, DVector};