diff --git a/README.md b/README.md
index 370081d..e2a8274 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@ In the current version, all the modules are optimized using **AVX-512** and **AV
 ### System requirement
 Operating System: Linux   
 mm2-fast was tested using g++ (GCC) 9.2.0 and icpc version 19.1.3.304   
-Architecture: x86\_64 CPUs with [AVX512][AVX2](https://en.wikipedia.org/wiki/Advanced_Vector_Extensions)   
+Architecture: x86\_64 CPUs with [AVX512, AVX2](https://en.wikipedia.org/wiki/Advanced_Vector_Extensions)   
 Memory requirement: ~30GB for human genome   
 
 ### Installation
diff --git a/options.c b/options.c
index 43cb956..0b1c29d 100644
--- a/options.c
+++ b/options.c
@@ -94,8 +94,8 @@ int mm_set_opt(const char *preset, mm_idxopt_t *io, mm_mapopt_t *mo)
 		mo->bw = mo->bw_long = 2000;
 		mo->occ_dist = 0;
 	} else if (strcmp(preset, "map10k") == 0 || strcmp(preset, "map-pb") == 0) {
-		#if defined (PARALLEL_CHAINING) && (defined(__AVX2__)) 
-			enable_vect_dp_chaining = false;
+		#if defined (PARALLEL_CHAINING) && (defined(__AVX2__)) && (!defined(__AVX512BW__))
+		enable_vect_dp_chaining = false;
 		#endif
 		io->flag |= MM_I_HPC, io->k = 19;
 	} else if (strcmp(preset, "ava-pb") == 0) {
@@ -105,8 +105,8 @@ int mm_set_opt(const char *preset, mm_idxopt_t *io, mm_mapopt_t *mo)
 		mo->bw_long = mo->bw;
 		mo->occ_dist = 0;
 	} else if (strcmp(preset, "map-hifi") == 0 || strcmp(preset, "map-ccs") == 0) {
-		#if defined (PARALLEL_CHAINING) && (defined(__AVX2__)) 
-			enable_vect_dp_chaining = false;
+		#if defined (PARALLEL_CHAINING) && (defined(__AVX2__)) && (!defined(__AVX512BW__))
+		enable_vect_dp_chaining = false;
 		#endif
 		io->flag = 0, io->k = 19, io->w = 19;
 		mo->max_gap = 10000;