1 files changed, 3 insertions, 4 deletions

diff --git a/src/nissy.h b/src/nissy.h
index b13f417..c23f338 100644
--- a/src/nissy.h
+++ b/src/nissy.h
@@ -360,8 +360,7 @@ Parameters:
    minmoves  - The minimum number of moves for a solution.
    maxmoves  - The maximum number of moves for a solution.
    maxsols   - The maximum number of solutions.
-   optimal   - If set to a non-negative value, the maximum number of moves
-               above the optimal solution length.
+   optimal   - The maximum number of moves above the optimal solution length.
    threads   - The number of threads to use. Must be less than or equalt to
                the value of the compile-time constant THREADS. If set to 0,
                the default value THREADS will be used.
@@ -393,8 +392,8 @@ nissy_solve(
         unsigned minmoves,
         unsigned maxmoves,
         unsigned maxsolutions,
-        int optimal,
-        int threads,
+        unsigned optimal,
+        unsigned threads,
         unsigned long long data_size,
         const char data[data_size],
         unsigned sols_size,