diff --git a/docs/changelog.markdown b/docs/changelog.markdown
index 2e50e7bbb..edbf804b6 100644
--- a/docs/changelog.markdown
+++ b/docs/changelog.markdown
@@ -10,6 +10,9 @@ daily) from the master branch.  It may not be usable and
 the feature set may change.  As features stabilize some
 brief notes about them may accumulate here.
 
+* New: split/pane support!
+  See [#157](https://github.com/wez/wezterm/issues/157) for
+  overall status and additional information.
 * The GUI layer now normalizes SHIFT state for keyboard processing.
   If a keypress is ASCII uppercase and SHIFT is held then the
   SHIFT modifier is removed from the set of active modifiers.  This
@@ -24,9 +27,6 @@ brief notes about them may accumulate here.
   number to be zero based.
 * On Linux and macOS systems, wezterm can now attempt to guess the current
   working directory that should be set in newly spawned local panes/tabs.
-* Experimental support for splits/panes.
-  See [#157](https://github.com/wez/wezterm/issues/157) for
-  overall status and additional information.
 * We now bundle JetBrains Mono and use it as the default font,
   and add it as a default fallback font.  Similarly, we also
   bundle Noto Color Emoji as a default fallback for emoji.
@@ -34,6 +34,8 @@ brief notes about them may accumulate here.
   automatic config reloading.  When set to false, you will need
   to manually trigger a config reload (default: `SUPER+R` or
   `CTRL+SHIFT+R`)
+* [`CloseCurrentTab`](config/lua/keyassignment/CloseCurrentTab.md)
+  now requires a `confirm` parameter.
 
 ### 20200909-002054-4c9af461
 
diff --git a/docs/config/lua/keyassignment/CloseCurrentPane.md b/docs/config/lua/keyassignment/CloseCurrentPane.md
new file mode 100644
index 000000000..d5fd01c84
--- /dev/null
+++ b/docs/config/lua/keyassignment/CloseCurrentPane.md
@@ -0,0 +1,25 @@
+# CloseCurrentPane
+
+Closes the current pane.  If that was the last pane in the tab, closes the tab.
+If that was the last tab, closes that window.  If that was the last window,
+wezterm terminates.
+
+The act of closing a pane shuts down the PTY associated with the pane and
+then kills the process associated with that pane.
+
+```lua
+return {
+  keys = {
+    {key="w", mods="CMD",
+     action=wezterm.action{CloseCurrentPane={confirm=true}}
+  }
+}
+```
+
+When `confirm` is true, an overlay will render over the pane to
+ask you to confirm whether you want to close it.
+
+If `confirm` is false then this action will immediately close
+the pane without prompting.
+
+
diff --git a/docs/config/lua/keyassignment/CloseCurrentTab.md b/docs/config/lua/keyassignment/CloseCurrentTab.md
index 86e63e627..f24d22e45 100644
--- a/docs/config/lua/keyassignment/CloseCurrentTab.md
+++ b/docs/config/lua/keyassignment/CloseCurrentTab.md
@@ -1,8 +1,7 @@
 # CloseCurrentTab
 
-Equivalent to clicking the `x` on the window title bar to close it: Closes the
-current tab.  If that was the last tab, closes that window.  If that was the
-last window, wezterm terminates.
+Closes the current tab, terminating all contained panes.  If that was the last
+tab, closes that window.  If that was the last window, wezterm terminates.
 
 ```lua
 return {
@@ -12,4 +11,23 @@ return {
 }
 ```
 
+*Since: nightly*
+
+The nightly builds have changed `CloseCurrentTab` so that it requires
+a boolean `confirm` parameter:
+
+```lua
+return {
+  keys = {
+    {key="w", mods="CMD",
+     action=wezterm.action{CloseCurrentTab={confirm=true}}
+  }
+}
+```
+
+When `confirm` is true, an overlay will render over the tab to
+ask you to confirm whether you want to close it.
+
+If `confirm` is false then this action will immediately close
+the tab and terminates its panes without prompting.