diff --git a/desc/Descriptor.py b/desc/Descriptor.py
index 2e848ea..8bd488c 100644
--- a/desc/Descriptor.py
+++ b/desc/Descriptor.py
@@ -27,9 +27,10 @@ class USB_DescriptorSize(Enum):
 
 # base class for descriptor generator
 class Descriptor(StructGenerator.StructRecord):
+    QUALIFIERS = "const"
     def __init__(self, name, ctype, content, comment=None):
         super().__init__(name, ctype, content, comment)
-        self.qualifiers = "const"
+        self.qualifiers = Descriptor.QUALIFIERS
         self.typedef = ctype[8:]
         self.attribute = "packed"
 
diff --git a/desc/main.py b/desc/main.py
index 8830e79..8498b2a 100644
--- a/desc/main.py
+++ b/desc/main.py
@@ -10,10 +10,21 @@ from ConfigGenerator import ConfigGenerator
 
 # fetch USB settings
 usb_config_file_name = argv[1]
+#usb_config_file_name = "/home/epagris/VCSDEV/usbt1/stws/USB-T1/Modules/flatUSB/desc/usb_config_cdc.json"
 with open(usb_config_file_name, 'r') as usb_config_file:
     usb_config_data = usb_config_file.read()
 usb_config = json.loads(usb_config_data)
 
+# process "misc"
+if "misc" in usb_config:
+    misc = usb_config["misc"]
+
+    # mutable descriptors
+    if "mutable_descriptors" in misc:
+        if misc["mutable_descriptors"]:
+            desc.Descriptor.QUALIFIERS = ""
+
+# generate config
 cfggen = ConfigGenerator(usb_config)
 cfggen.generate()