diff --git a/misc/README.md b/misc/README.md
index 991f02c2..f9d52f5c 100644
--- a/misc/README.md
+++ b/misc/README.md
@@ -16,7 +16,8 @@ minimap2 -c test/MT-human.fa test/MT-orang.fa \
   | paftools.js liftover -l10000 - <(echo -e "MT_orang\t2000\t5000")     # liftOver
 # no test data for the following examples
 paftools.js junceval -e anno.gtf splice.sam > out.txt  # compare splice junctions to annotations
-paftools.js splice2bed anno.gtf > anno.bed             # convert GTF/GFF3 to BED12
+paftools.js splice2bed splice.sam > splice.bed             # convert PAF/SAM to BED12
+paftools.js gff2bed anno.gtf > anno.bed             # convert GTF/GFF3 to BED12
 ```
 
 ## Table of Contents
diff --git a/python/cmappy.h b/python/cmappy.h
index 6bc5635d..8428351b 100644
--- a/python/cmappy.h
+++ b/python/cmappy.h
@@ -71,13 +71,13 @@ static inline void mm_reset_timer(void)
 }
 
 extern unsigned char seq_comp_table[256];
-static inline mm_reg1_t *mm_map_aux(const mm_idx_t *mi, const char *seq1, const char *seq2, int *n_regs, mm_tbuf_t *b, const mm_mapopt_t *opt)
+static inline mm_reg1_t *mm_map_aux(const mm_idx_t *mi, const char* seqname, const char *seq1, const char *seq2, int *n_regs, mm_tbuf_t *b, const mm_mapopt_t *opt)
 {
 	mm_reg1_t *r;
 
 	Py_BEGIN_ALLOW_THREADS
 	if (seq2 == 0) {
-		r = mm_map(mi, strlen(seq1), seq1, n_regs, b, opt, NULL);
+		r = mm_map(mi, strlen(seq1), seq1, n_regs, b, opt, seqname);
 	} else {
 		int _n_regs[2];
 		mm_reg1_t *regs[2];
@@ -94,7 +94,7 @@ static inline mm_reg1_t *mm_map_aux(const mm_idx_t *mi, const char *seq1, const
 			seq[1][i] = seq_comp_table[t];
 		}
 		if (len[1]&1) seq[1][len[1]>>1] = seq_comp_table[(uint8_t)seq[1][len[1]>>1]];
-		mm_map_frag(mi, 2, len, (const char**)seq, _n_regs, regs, b, opt, NULL);
+		mm_map_frag(mi, 2, len, (const char**)seq, _n_regs, regs, b, opt, seqname);
 		for (i = 0; i < _n_regs[1]; ++i)
 			regs[1][i].rev = !regs[1][i].rev;
 		*n_regs = _n_regs[0] + _n_regs[1];
diff --git a/python/cmappy.pxd b/python/cmappy.pxd
index 05bb7a9b..38432746 100644
--- a/python/cmappy.pxd
+++ b/python/cmappy.pxd
@@ -129,7 +129,7 @@ cdef extern from "cmappy.h":
 
 	void mm_reg2hitpy(const mm_idx_t *mi, mm_reg1_t *r, mm_hitpy_t *h)
 	void mm_free_reg1(mm_reg1_t *r)
-	mm_reg1_t *mm_map_aux(const mm_idx_t *mi, const char *seq1, const char *seq2, int *n_regs, mm_tbuf_t *b, const mm_mapopt_t *opt)
+	mm_reg1_t *mm_map_aux(const mm_idx_t *mi, const char* seqname, const char *seq1, const char *seq2, int *n_regs, mm_tbuf_t *b, const mm_mapopt_t *opt)
 	char *mappy_fetch_seq(const mm_idx_t *mi, const char *name, int st, int en, int *l)
 	mm_idx_t *mappy_idx_seq(int w, int k, int is_hpc, int bucket_bits, const char *seq, int l)
 
diff --git a/python/mappy.pyx b/python/mappy.pyx
index 0a6b93cd..474f833e 100644
--- a/python/mappy.pyx
+++ b/python/mappy.pyx
@@ -113,7 +113,7 @@ cdef class Aligner:
 	cdef cmappy.mm_idxopt_t idx_opt
 	cdef cmappy.mm_mapopt_t map_opt
 
-	def __cinit__(self, fn_idx_in=None, preset=None, k=None, w=None, min_cnt=None, min_chain_score=None, min_dp_score=None, bw=None, bw_long=None, best_n=None, n_threads=3, fn_idx_out=None, max_frag_len=None, extra_flags=None, seq=None, scoring=None):
+	def __cinit__(self, fn_idx_in=None, preset=None, k=None, w=None, min_cnt=None, min_chain_score=None, min_dp_score=None, bw=None, bw_long=None, best_n=None, n_threads=3, fn_idx_out=None, max_frag_len=None, extra_flags=None, seq=None, scoring=None, sc_ambi=None, max_chain_skip=None):
 		self._idx = NULL
 		cmappy.mm_set_opt(NULL, &self.idx_opt, &self.map_opt) # set the default options
 		if preset is not None:
@@ -138,6 +138,8 @@ cdef class Aligner:
 				self.map_opt.q2, self.map_opt.e2 = scoring[4], scoring[5]
 				if len(scoring) >= 7:
 					self.map_opt.sc_ambi = scoring[6]
+		if sc_ambi is not None: self.map_opt.sc_ambi = sc_ambi
+		if max_chain_skip is not None: self.map_opt.max_chain_skip = max_chain_skip
 
 		cdef cmappy.mm_idx_reader_t *r;
 
@@ -163,7 +165,7 @@ cdef class Aligner:
 	def __bool__(self):
 		return (self._idx != NULL)
 
-	def map(self, seq, seq2=None, buf=None, cs=False, MD=False, max_frag_len=None, extra_flags=None):
+	def map(self, seq, seq2=None, name=None, buf=None, cs=False, MD=False, max_frag_len=None, extra_flags=None):
 		cdef cmappy.mm_reg1_t *regs
 		cdef cmappy.mm_hitpy_t h
 		cdef ThreadBuffer b
@@ -185,11 +187,20 @@ cdef class Aligner:
 		km = cmappy.mm_tbuf_get_km(b._b)
 
 		_seq = seq if isinstance(seq, bytes) else seq.encode()
+		if name is not None:
+			_name = name if isinstance(name, bytes) else name.encode()
+
 		if seq2 is None:
-			regs = cmappy.mm_map_aux(self._idx, _seq, NULL,  &n_regs, b._b, &map_opt)
+			if name is None:
+				regs = cmappy.mm_map_aux(self._idx, NULL, _seq, NULL,  &n_regs, b._b, &map_opt)
+			else:
+				regs = cmappy.mm_map_aux(self._idx, _name, _seq, NULL,  &n_regs, b._b, &map_opt)
 		else:
 			_seq2 = seq2 if isinstance(seq2, bytes) else seq2.encode()
-			regs = cmappy.mm_map_aux(self._idx, _seq, _seq2, &n_regs, b._b, &map_opt)
+			if name is None:
+				regs = cmappy.mm_map_aux(self._idx, NULL, _seq, _seq2, &n_regs, b._b, &map_opt)
+			else:
+				regs = cmappy.mm_map_aux(self._idx, _name, _seq, _seq2, &n_regs, b._b, &map_opt)
 
 		try:
 			i = 0