diff --git a/lib/kcnf.cpp b/lib/kcnf.cpp
index 259e059..9ca3b45 100644
--- a/lib/kcnf.cpp
+++ b/lib/kcnf.cpp
@@ -26,7 +26,8 @@ long binom(long n, long k) {
 }
 
 // get the (n choose k) possible variable choices at index idx
-// example: 
+// example: unrank_combination(5,3,5) -> (1,4,5)
+// the full combination list would look like: (1,2,3), (1,2,4), (1,2,5), (1,3,4), (1,3,5), (1,4,5) <- this is the combination on index 5
 std::vector<int> unrank_combination(long n, long k, long long idx) {
     std::vector<int> comb;
     comb.reserve(k);