diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7907e5903..f2d7ce991 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Enabled supported box chars for legacy Windows, and introduce `safe_box` flag
 - Disable hyperlinks on legacy Windows
 - Constructors for Rule and Panel now have keyword only arguments (reason for major version bump)
+- Table.add_colum added keyword only arguments
 
 ### Fixed
 
diff --git a/rich/panel.py b/rich/panel.py
index 9b5b410d9..b108acaf8 100644
--- a/rich/panel.py
+++ b/rich/panel.py
@@ -47,11 +47,11 @@ def __init__(
     ) -> None:
         self.renderable = renderable
         self.box = box
+        self.safe_box = safe_box
         self.expand = expand
         self.style = style
         self.width = width
         self.padding = padding
-        self.safe_box = safe_box
 
     def __rich_console__(
         self, console: Console, options: ConsoleOptions
diff --git a/rich/table.py b/rich/table.py
index 43e4b6c90..b8a7c729d 100644
--- a/rich/table.py
+++ b/rich/table.py
@@ -150,6 +150,7 @@ def __init__(
         self.caption = caption
         self.width = width
         self.box = box
+        self.safe_box = safe_box
         self._padding = Padding.unpack(padding)
         self.pad_edge = pad_edge
         self.expand = expand
@@ -164,7 +165,6 @@ def __init__(
         self.border_style = border_style
         self.title_style = title_style
         self.caption_style = title_style
-        self.safe_box = safe_box
         self._row_count = 0
         self.row_styles = list(row_styles or [])
 
@@ -227,14 +227,12 @@ def __rich_measure__(self, console: "Console", max_width: int) -> Measurement:
 
         extra_width = self._extra_width
         _measure_column = self._measure_column
-        minimum_width = sum(
-            _measure_column(console, column, max_width).minimum
-            for column in self.columns
-        )
-        maximum_width = sum(
-            _measure_column(console, column, max_width).maximum
-            for column in self.columns
-        )
+
+        measurements = [
+            _measure_column(console, column, max_width) for column in self.columns
+        ]
+        minimum_width = sum(measurement.minimum for measurement in measurements)
+        maximum_width = sum(measurement.maximum for measurement in measurements)
         return Measurement(minimum_width + extra_width, maximum_width + extra_width)
 
     @property
@@ -252,6 +250,7 @@ def add_column(
         self,
         header: "RenderableType" = "",
         footer: "RenderableType" = "",
+        *,
         header_style: StyleType = None,
         footer_style: StyleType = None,
         style: StyleType = None,