Note that LINEAR_PROBES can be set to zero.
diff --git a/Objects/setobject.c b/Objects/setobject.c
index 22d9cb3..adc99da 100644
--- a/Objects/setobject.c
+++ b/Objects/setobject.c
@@ -43,7 +43,7 @@
 /* ======================================================================== */
 /* ======= Begin logic for probing the hash table ========================= */
 
-/* This should be >= PySet_MINSIZE - 1 */
+/* Set this to zero to turn-off linear probing */
 #ifndef LINEAR_PROBES
 #define LINEAR_PROBES 9
 #endif