diff --git a/copyparty/authsrv.py b/copyparty/authsrv.py
index 085a805f..6ccaafe7 100644
--- a/copyparty/authsrv.py
+++ b/copyparty/authsrv.py
@@ -1389,8 +1389,16 @@ class AuthSrv(object):
             name = name.lower()
 
             # volflags are snake_case, but a leading dash is the removal operator
-            if name not in flagdescs and "-" in name[1:]:
-                name = name[:1] + name[1:].replace("-", "_")
+            stripped = name.lstrip("-")
+            zi = len(name) - len(stripped)
+            if zi > 1:
+                t = "WARNING: the config for volume [/%s] specified a volflag with multiple leading hyphens (%s); use one hyphen to remove, or zero hyphens to add a flag. Will now enable flag [%s]"
+                self.log(t % (vpath, name, stripped), 3)
+                name = stripped
+                zi = 0
+
+            if stripped not in flagdescs and "-" in stripped:
+                name = ("-" * zi) + stripped.replace("-", "_")
 
         desc = flagdescs.get(name.lstrip("-"), "?").replace("\n", " ")
 
@@ -1576,6 +1584,11 @@ class AuthSrv(object):
         for vol in vfs.all_vols.values():
             unknown_flags = set()
             for k, v in vol.flags.items():
+                stripped = k.lstrip("-")
+                if k != stripped and stripped not in vol.flags:
+                    t = "WARNING: the config for volume [/%s] tried to remove volflag [%s] by specifying [%s] but that volflag was not already set"
+                    self.log(t % (vol.vpath, stripped, k), 3)
+                k = stripped
                 if k not in flagdescs and k not in k_ign:
                     unknown_flags.add(k)
             if unknown_flags:
diff --git a/copyparty/cfg.py b/copyparty/cfg.py
index 224f1955..fbf053dc 100644
--- a/copyparty/cfg.py
+++ b/copyparty/cfg.py
@@ -156,7 +156,8 @@ flagcats = {
         "daw": "enable full WebDAV write support (dangerous);\nPUT-operations will now \033[1;31mOVERWRITE\033[0;35m existing files",
         "nosub": "forces all uploads into the top folder of the vfs",
         "magic": "enables filetype detection for nameless uploads",
-        "gz": "allows server-side gzip of uploads with ?gz (also c,xz)",
+        "gz": "allows server-side gzip compression of uploads with ?gz",
+        "xz": "allows server-side lzma compression of uploads with ?xz",
         "pk": "forces server-side compression, optional arg: xz,9",
     },
     "upload rules": {
diff --git a/copyparty/up2k.py b/copyparty/up2k.py
index d690de67..f8e20842 100644
--- a/copyparty/up2k.py
+++ b/copyparty/up2k.py
@@ -1081,7 +1081,7 @@ class Up2k(object):
         ft = "\033[0;32m{}{:.0}"
         ff = "\033[0;35m{}{:.0}"
         fv = "\033[0;36m{}:\033[90m{}"
-        zs = "html_head mv_re_r mv_re_t rm_re_r rm_re_t srch_re_dots srch_re_nodot"
+        zs = "ext_th_d html_head mv_re_r mv_re_t rm_re_r rm_re_t srch_re_dots srch_re_nodot"
         fx = set(zs.split())
         fd = vf_bmap()
         fd.update(vf_cmap())