diff --git a/Changes b/Changes
index 6cbe8ff..16a0ee0 100644
--- a/Changes
+++ b/Changes
@@ -44,9 +44,10 @@ v0.6.0 - UNRELEASED
   * Added `peco.FreezeResults` / `peco.UnfreezeResults` actions.
     Freezing locks the current result set so you can clear the query,
     switch filters, and continue filtering against the frozen subset (#424, #596).
-  * Added `--height` option for inline display. Limits peco to the
-    specified number of terminal rows instead of taking over the full
-    screen (#471, #598).
+  * Added `--height` option for inline display. Accepts a line count
+    (e.g. `--height 5`) or a percentage (e.g. `--height 50%`) and
+    renders peco inline instead of taking over the full screen
+    (#471, #598).
   * Added `peco.ZoomIn` / `peco.ZoomOut` actions that expand visible
     context around matched lines, showing surrounding lines (#289, #600).
   * Added ANSI color rendering support via `--color=auto|none` CLI flag
@@ -54,14 +55,17 @@ v0.6.0 - UNRELEASED
     `git log --color` or `rg --color` is now displayed with colors
     preserved. Default is `auto` (enabled) (#398, #602).
   * Added `IRegexp` filter for case-insensitive regexp matching, so you
-    no longer need to manually type `(?i)` in regex queries (#564).
+    no longer need to manually type `(?i)` in regex queries. `IRegexp`
+    can also be used as a value for `--initial-filter` / `InitialFilter`
+    (#564).
   * Added `--exit-0` option to immediately exit with non-zero status
     when the input is empty, analogous to `--select-1` (#538, #582).
   * Added Ctrl+Shift key modifier and CSI u / fixterms escape sequence
     support for modern terminals (#529, #581).
   * Added Page Up/Down and Home/End key support (#428, #584).
-  * Added a new layout type: top-down list with query prompt at the
-    bottom (#445, #595).
+  * Added a new `top-down-query-bottom` layout: top-down list with
+    query prompt at the bottom. Use `--layout top-down-query-bottom`
+    or `"Layout": "top-down-query-bottom"` in config (#445, #595).
   * Added man page (`peco.1`) for offline documentation (#467, #587).
   * Added support for ANSI color codes in the `--prompt` string (#294, #586).
   * Added `--select-all` option to select all input lines and immediately
diff --git a/README.md b/README.md
index 54adbc0..a84f78b 100644
--- a/README.md
+++ b/README.md
@@ -472,7 +472,7 @@ You can change the query line's prompt, which is `QUERY>` by default.
 
 ### InitialFilter
 
-Specifies the filter name to start peco with. You should specify the name of the filter, such as `IgnoreCase`, `CaseSensitive`, `SmartCase`, `Regexp` and `Fuzzy`.
+Specifies the filter name to start peco with. You should specify the name of the filter, such as `IgnoreCase`, `CaseSensitive`, `SmartCase`, `IRegexp`, `Regexp` and `Fuzzy`.
 
 ### FuzzyLongestSort
 
@@ -533,6 +533,20 @@ very long lines that prohibit peco from reading them, try increasing this number
 
 The same time, the default MaxScanBuferSize is 256kb.
 
+### FilterBufSize
+
+```json
+{
+    "FilterBufSize": 1000
+}
+```
+
+Controls the number of lines buffered internally during filtering. If you are
+working with very large inputs and notice sluggish filter updates, you can try
+adjusting this value.
+
+Default value for FilterBufSize is 1000.
+
 ### Color
 
 ```json