diff --git a/user_manual/guides/SparseSweeps.md b/user_manual/guides/SparseSweeps.md
index 03fea2eb4b4a187354a0b4ebf5bfefed62ead208..a252253bb73b9a91e8a244f4c15615c2fae3aeef 100644
--- a/user_manual/guides/SparseSweeps.md
+++ b/user_manual/guides/SparseSweeps.md
@@ -8,6 +8,8 @@ The code shown in this guide is taken from the *SparseSpiral* example:
 
 `sfg-walberla` supports the generation of sparse sweeps, which operate only on a subset of cells
 defined by a user-provided *index list*.
+This can be useful if a numerical rule needs to be applied only in specific regions of the simulation
+domain, especially if those regions have an irregular geometry.
 
 To turn your sweep into a sparse sweep, simply set its `sparse` property to `True`.
 To illustrate, here's a sparse sweep that stores the coordinates of each cell