diff --git a/CHANGELOG.md b/CHANGELOG.md
index b7c1b1c4..7fc9df93 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,11 @@
+v0.6.66
+* [web] Added ability to edit attribute data of multiple selected features ("select features" tool).
+* [web] Added interactive tool for adding points to point-type layer by clicking on the map.
+* [web] Added "Add empty layer" button to the layers menu.
+* [web] Added "drag-to-resize" tool for resizing rectangular polygons interactively.
+* [web] Added center handle for dragging the interactive box tool.
+* Added -o fit-extent= option, to use a layer extent (typically a layer containing a single rectangle) for setting the extent of SVG output.
+
 v0.6.65
 * Added "drag-to-resize" editing mode for resizing rectangles interactively.
 
diff --git a/REFERENCE.md b/REFERENCE.md
index 3217ba23..db4fa166 100644
--- a/REFERENCE.md
+++ b/REFERENCE.md
@@ -1,6 +1,6 @@
 # COMMAND REFERENCE
 
-This documentation applies to version 0.6.64 of mapshaper's command line program. Run `mapshaper -v` to check your version. For an introduction to the command line tool, read [this page](https://github.com/mbloch/mapshaper/wiki/Introduction-to-the-Command-Line-Tool) first.
+This documentation applies to version 0.6.66 of mapshaper's command line program. Run `mapshaper -v` to check your version. For an introduction to the command line tool, read [this page](https://github.com/mbloch/mapshaper/wiki/Introduction-to-the-Command-Line-Tool) first.
 
 ## Command line syntax
 
@@ -264,6 +264,8 @@ Save content of the target layer(s) to a file or files.
 
 `svg-bbox=<xmin,ymin,xmax,ymax>` (SVG)  Bounding box of SVG map in projected map units. By default, the extent of SVG output fits the content; this option lets you provide a custom extent. This could be useful when aligning the SVG output with other content layers, such as images or videos.
 
+`fit-extent=<layer id>` (SVG) Use a layer (typically a layer containing a single rectangle) to set the extent of the map. Paths that overflow this extent are retained in the SVG output.
+
 `point-symbol=square`  (SVG) Use squares instead of circles to symbolize point data.
 
 `delimiter=`  (CSV) Set the field delimiter for CSV/delimited text output; e.g. `delimiter=|`.
diff --git a/package-lock.json b/package-lock.json
index dc7fbee7..a726c1f4 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "mapshaper",
-  "version": "0.6.65",
+  "version": "0.6.66",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "mapshaper",
-      "version": "0.6.65",
+      "version": "0.6.66",
       "license": "MPL-2.0",
       "dependencies": {
         "@placemarkio/tokml": "^0.3.3",
diff --git a/package.json b/package.json
index e062e410..f34b636c 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "mapshaper",
-  "version": "0.6.65",
+  "version": "0.6.66",
   "description": "A tool for editing vector datasets for mapping and GIS.",
   "keywords": [
     "shapefile",
diff --git a/src/cli/mapshaper-options.mjs b/src/cli/mapshaper-options.mjs
index e32455fd..62d860c5 100644
--- a/src/cli/mapshaper-options.mjs
+++ b/src/cli/mapshaper-options.mjs
@@ -365,7 +365,7 @@ export function getOptionParser() {
       type: 'bbox'
     })
     .option('fit-extent', {
-      describe: '[SVG] layer to use for the viewport extent'
+      describe: '[SVG] layer to use for the map extent'
     })
     .option('point-symbol', {
       describe: '[SVG] circle or square (default is circle)'