diff --git a/docs/src/tutorial/genomic-surveillance.rst b/docs/src/tutorial/genomic-surveillance.rst
index 2f8927629..158d1c919 100644
--- a/docs/src/tutorial/genomic-surveillance.rst
+++ b/docs/src/tutorial/genomic-surveillance.rst
@@ -127,7 +127,7 @@ The output dataset is renamed ``idaho``, representative of the new custom data i
 subsampling
 ***********
 
-This is a new section that provides a subsampling scheme ``idaho_scheme`` consisting of three subsamples:
+This is a new section that provides a subsampling scheme ``idaho_scheme`` consisting of three subsamples. Without this, the output dataset would use all the provided data, which in this case is thousands of sequences that are often disproportionally representative of the underlying population.
 
 1. ``custom_sample``