diff --git a/lib/script/script.js b/lib/script/script.js
index 641a724..ed7428a 100644
--- a/lib/script/script.js
+++ b/lib/script/script.js
@@ -182,32 +182,40 @@ Script.fromString = function(str) {
   return script;
 };
 
-Script.prototype.toString = function() {
+Script.prototype._chunkToString = function(chunk) {
+  var opcodenum = chunk.opcodenum;
   var str = '';
-  for (var i = 0; i < this.chunks.length; i++) {
-    var chunk = this.chunks[i];
-    var opcodenum = chunk.opcodenum;
-    if (!chunk.buf) {
-      if (typeof Opcode.reverseMap[opcodenum] !== 'undefined') {
-        str = str + ' ' + Opcode(opcodenum).toString();
-      } else {
-        var numstr = opcodenum.toString(16);
-        if (numstr.length % 2 !== 0) {
-          numstr = '0' + numstr;
-        }
-        str = str + ' ' + '0x' + numstr;
-      }
+  if (!chunk.buf) {
+    // no data chunk
+    if (typeof Opcode.reverseMap[opcodenum] !== 'undefined') {
+      str = str + ' ' + Opcode(opcodenum).toString();
     } else {
-      if (opcodenum === Opcode.OP_PUSHDATA1 ||
-        opcodenum === Opcode.OP_PUSHDATA2 ||
-        opcodenum === Opcode.OP_PUSHDATA4) {
-        str = str + ' ' + Opcode(opcodenum).toString();
-      }
-      str = str + ' ' + chunk.len;
-      if (chunk.len > 0) {
-        str = str + ' ' + '0x' + chunk.buf.toString('hex');
+      var numstr = opcodenum.toString(16);
+      if (numstr.length % 2 !== 0) {
+        numstr = '0' + numstr;
       }
+      str = str + ' ' + '0x' + numstr;
+    }
+  } else {
+    // data chunk
+    if (opcodenum === Opcode.OP_PUSHDATA1 ||
+      opcodenum === Opcode.OP_PUSHDATA2 ||
+      opcodenum === Opcode.OP_PUSHDATA4) {
+      str = str + ' ' + Opcode(opcodenum).toString();
     }
+    str = str + ' ' + chunk.len;
+    if (chunk.len > 0) {
+      str = str + ' ' + '0x' + chunk.buf.toString('hex');
+    }
+  }
+  return str;
+};
+
+Script.prototype.toString = function() {
+  var str = '';
+  for (var i = 0; i < this.chunks.length; i++) {
+    var chunk = this.chunks[i];
+    str += this._chunkToString(chunk);
   }
 
   return str.substr(1);
@@ -480,10 +488,10 @@ Script.prototype._addByType = function(obj, prepend) {
     this._addOpcode(obj, prepend);
   } else if (BufferUtil.isBuffer(obj)) {
     this._addBuffer(obj, prepend);
-  } else if (typeof obj === 'object') {
-    this._insertAtPosition(obj, prepend);
   } else if (obj instanceof Script) {
     this.chunks = this.chunks.concat(obj.chunks);
+  } else if (typeof obj === 'object') {
+    this._insertAtPosition(obj, prepend);
   } else {
     throw new Error('Invalid script chunk');
   }
@@ -583,7 +591,7 @@ Script.buildMultisigOut = function(publicKeys, threshold, opts) {
  *
  * @param {PublicKey[]} pubkeys list of all public keys controlling the output
  * @param {number} threshold amount of required signatures to spend the output
- * @param {Array} signatures signatures to append to the script
+ * @param {Array} signatures and array of signature buffers to append to the script
  * @param {Object=} opts
  * @param {boolean=} opts.noSorting don't sort the given public keys before creating the script (false by default)
  * @param {Script=} opts.cachedMultisig don't recalculate the redeemScript
@@ -598,6 +606,8 @@ Script.buildP2SHMultisigIn = function(pubkeys, threshold, signatures, opts) {
   var s = new Script();
   s.add(Opcode.OP_0);
   _.each(signatures, function(signature) {
+    $.checkArgument(BufferUtil.isBuffer(signature), 'Signatures must be an array of Buffers');
+    // TODO: allow signatures to be an array of Signature objects
     s.add(signature);
   });
   s.add((opts.cachedMultisig || Script.buildMultisigOut(pubkeys, threshold, opts)).toBuffer());
diff --git a/test/script/script.js b/test/script/script.js
index 71cd7df..54a3d6b 100644
--- a/test/script/script.js
+++ b/test/script/script.js
@@ -430,6 +430,24 @@ describe('Script', function() {
     it('should work for no data OP_RETURN', function() {
       Script().add(Opcode.OP_RETURN).add(new Buffer('')).toString().should.equal('OP_RETURN 0');
     });
+    it('works with objects', function() {
+      Script().add({
+        opcodenum: 106
+      }).toString().should.equal('OP_RETURN');
+    });
+    it('works with another script', function() {
+      var someScript = Script('OP_2 21 0x038282263212c609d9ea2a6e3e172de238d8c39cabd5ac1ca10646e23fd5f51508 ' +
+        '21 0x038282263212c609d9ea2a6e3e172de238d8c39cabd5ac1ca10646e23fd5f51508 OP_2 OP_CHECKMULTISIG');
+      var s = new Script().add(someScript);
+      s.toString()
+        .should.equal(someScript.toString());
+    });
+    it('fails with wrong type', function() {
+      var fails = function() {
+        return new Script().add(true);
+      };
+      fails.should.throw('Invalid script chunk');
+    });
   });
 
   describe('#isStandard', function() {