diff --git a/CHANGELOG.md b/CHANGELOG.md
index eeb4eab4..b160f34f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+v0.6.56
+* Added support for importing ES modules using the -require command.
+* Removed the -require init= function.
+
 v0.6.55
 * Improvements to the web UI intersections tool.
 
diff --git a/REFERENCE.md b/REFERENCE.md
index cf98bb8c..03eb03b5 100644
--- a/REFERENCE.md
+++ b/REFERENCE.md
@@ -1034,20 +1034,26 @@ mapshaper ne_50m_rivers_lake_centerlines.shp ne_50m_land.shp combine-files \
 
 ### -require
 
-Require a Node module for use in commands like `-each` and `-run`. Required modules are added to the expression context. Named expressions are accessed via thair names or aliases. Unnamed modules have their exported properties added to the expression context.
+Require a Node module or ES module for use in commands like `-each` and `-run`. Modules are added to the expression context. When the `alias=` option is given, modules are accessed via their aliases. Modules that are imported by name (e.g. `-require d3`) are accessed via their name, or by their alias if the `alias=` option is used. Module files without an alias name have their exported functions and data added directly to the expression context.
 
-`<module>` or `module=`  Name of a Node module or path to a module file.
+`<module>` or `module=`  Name of an installed module or path to a module file.
 
-`alias=`  Use an alias for a named module or module file.
-
-`init=`  JS expression to run after the module loads.
+`alias=` Import the module as a custom-named variable.
 
 ```bash
-# Example: use the underscore module
+# Example: use the underscore module (which has been installed locally)
 $ mapshaper data.json \
 	-require underscore alias=_ \
 	-each 'id = _.uniqueId()' \
-	-o data.json force
+	-o data2.json
+```
+
+```bash
+# Example: import a module file containing a user-defined function 
+$ mapshaper data.json \
+  -require scripts/includes.mjs \
+  -each 'displayname = getDisplayName(d)' \
+  -o data2.json
 ```
 
 ### -run
@@ -1089,9 +1095,9 @@ $ mapshaper -i country.shp -require projection.js -run '-proj {tmerc(target.bbox
 ```javascript
 // contents of projection.js file
 module.exports.tmerc = function(bbox) {
-	var lon0 = (bbox[0] + bbox[2]) / 2,
+  var lon0 = (bbox[0] + bbox[2]) / 2,
       lat0 = (bbox[1] + bbox[3]) / 2;
-	return `+proj=tmerc lat_0=${lat0} lon_0=${lon0}`;
+  return `+proj=tmerc lat_0=${lat0} lon_0=${lon0}`;
 };
 ```
 
diff --git a/package-lock.json b/package-lock.json
index 0ec6d8ce..918fc0da 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "mapshaper",
-  "version": "0.6.55",
+  "version": "0.6.56",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "mapshaper",
-      "version": "0.6.55",
+      "version": "0.6.56",
       "license": "MPL-2.0",
       "dependencies": {
         "@placemarkio/tokml": "^0.3.3",
diff --git a/package.json b/package.json
index 0244e2c9..2be7bc5e 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "mapshaper",
-  "version": "0.6.55",
+  "version": "0.6.56",
   "description": "A tool for editing vector datasets for mapping and GIS.",
   "keywords": [
     "shapefile",
diff --git a/www/index.html b/www/index.html
index 19145af3..af47b22b 100644
--- a/www/index.html
+++ b/www/index.html
@@ -309,7 +309,7 @@ <h4>Options</h4>
 		<div class="coordinate-info colored-text selectable"></div>
 		<div class="intersection-display">
 			<span class="intersection-check text-btn colored-text">Check line intersections</span><span class="intersection-count">0 line intersections</span>
-			<img class="close-btn" src="images/close.png">
+			<img class="close-btn" draggable="false" src="images/close.png">
 			<div class="repair-btn text-btn colored-text">Repair</div>
 			
 		</div>