diff --git a/utz/fn.py b/utz/fn.py
index e88cebc..96bc64e 100644
--- a/utz/fn.py
+++ b/utz/fn.py
@@ -8,7 +8,11 @@
 
 def decos(*args: Deco | Sequence[Deco]):
     """Compose decorators."""
-    decos = [ deco for decos in args for deco in decos ]
+    decos = [
+        deco
+        for decos in args
+        for deco in (decos if isinstance(decos, Sequence) else [decos])
+    ]
 
     def _fn(fn):
         for deco in reversed(decos):
diff --git a/utz/plots.py b/utz/plots.py
index 7e4a60b..c39ad5d 100644
--- a/utz/plots.py
+++ b/utz/plots.py
@@ -232,11 +232,13 @@ def update_axis(
             update_axes(gridcolor=grid)
 
         if zerolines == xy_name or zerolines is True:
-            update_axes(
-                zeroline=True,
-                zerolinecolor=xy_grid or grid,
-                zerolinewidth=1,
-            )
+            zerolinecolor = xy_grid or grid
+            if zerolinecolor is not Unset:
+                update_axes(
+                    zeroline=True,
+                    zerolinecolor=zerolinecolor,
+                    zerolinewidth=1,
+                )
 
         xy_title = mk_title(xy_title)
         if xy_title: