X-Git-Url: https://git.distorted.org.uk/~mdw/sgt/puzzles/blobdiff_plain/07682b793f616607202800f0bf9f573dc3656b29..f646290a63e0adf65a8c3062caead98832289730:/dsf.c

diff --git a/dsf.c b/dsf.c
index f60ddc0..aa22392 100644
--- a/dsf.c
+++ b/dsf.c
@@ -165,7 +165,7 @@ void edsf_merge(int *dsf, int v1, int v2, int inverse)
 	 * We always make the smaller of v1 and v2 the new canonical
 	 * element. This ensures that the canonical element of any
 	 * class in this structure is always the first element in
-	 * it.
+	 * it. 'Keen' depends critically on this property.
 	 *
 	 * (Jonas Koelker previously had this code choosing which
 	 * way round to connect the trees by examining the sizes of