diff --git a/client/html/tag_merge.tpl b/client/html/tag_merge.tpl
index 90d8aa63..0ffbdd2b 100644
--- a/client/html/tag_merge.tpl
+++ b/client/html/tag_merge.tpl
@@ -2,12 +2,14 @@
     <form>
         <ul class='input'>
             <li class='target'>
-                <%= ctx.makeTextInput({required: true, text: 'Target tag', pattern: ctx.tagNamePattern}) %>
+                <%= ctx.makeTextInput({name: 'target-tag', required: true, text: 'Target tag', pattern: ctx.tagNamePattern}) %>
             </li>
 
             <li>
                 <p>Usages in posts, suggestions and implications will be
-                merged. Category and aliases need to be handled manually.</p>
+                merged. Category needs to be handled manually.</p>
+
+                <%= ctx.makeCheckbox({name: 'alias', text: 'Make this tag an alias of the target tag.'}) %>
 
                 <%= ctx.makeCheckbox({required: true, text: 'I confirm that I want to merge this tag.'}) %>
             </li>
diff --git a/client/js/controllers/tag_controller.js b/client/js/controllers/tag_controller.js
index c1de3a36..d33e3d72 100644
--- a/client/js/controllers/tag_controller.js
+++ b/client/js/controllers/tag_controller.js
@@ -97,16 +97,19 @@ class TagController {
     _evtMerge(e) {
         this._view.clearMessages();
         this._view.disableForm();
-        e.detail.tag.merge(e.detail.targetTagName).then(() => {
-            this._view.showSuccess('Tag merged.');
-            this._view.enableForm();
-            router.replace(
-                uri.formatClientLink('tag', e.detail.targetTagName, 'merge'),
-                null, false);
-        }, error => {
-            this._view.showError(error.message);
-            this._view.enableForm();
-        });
+        e.detail.tag
+            .merge(e.detail.targetTagName, e.detail.addAlias)
+            .then(() => {
+                this._view.showSuccess('Tag merged.');
+                this._view.enableForm();
+                router.replace(
+                    uri.formatClientLink(
+                        'tag', e.detail.targetTagName, 'merge'),
+                    null, false);
+            }, error => {
+                this._view.showError(error.message);
+                this._view.enableForm();
+            });
     }
 
     _evtDelete(e) {
diff --git a/client/js/models/tag.js b/client/js/models/tag.js
index 1a156936..ccfe6b21 100644
--- a/client/js/models/tag.js
+++ b/client/js/models/tag.js
@@ -75,7 +75,7 @@ class Tag extends events.EventTarget {
             });
     }
 
-    merge(targetName) {
+    merge(targetName, addAlias) {
         return api.get(uri.formatApiLink('tag', targetName))
             .then(response => {
                 return api.post(uri.formatApiLink('tag-merge'), {
@@ -84,6 +84,14 @@ class Tag extends events.EventTarget {
                     mergeToVersion: response.version,
                     mergeTo: targetName,
                 });
+            }).then(response => {
+                if (!addAlias) {
+                    return Promise.resolve(response);
+                }
+                return api.put(uri.formatApiLink('tag', targetName), {
+                    version: response.version,
+                    names: response.names.concat(this._names),
+                });
             }).then(response => {
                 this._updateFromResponse(response);
                 this.dispatchEvent(new CustomEvent('change', {
diff --git a/client/js/views/tag_merge_view.js b/client/js/views/tag_merge_view.js
index 711716c0..87ffb478 100644
--- a/client/js/views/tag_merge_view.js
+++ b/client/js/views/tag_merge_view.js
@@ -51,6 +51,7 @@ class TagMergeView extends events.EventTarget {
             detail: {
                 tag: this._tag,
                 targetTagName: this._targetTagFieldNode.value,
+                addAlias: this._addAliasCheckboxNode.checked,
             },
         }));
     }
@@ -60,7 +61,11 @@ class TagMergeView extends events.EventTarget {
     }
 
     get _targetTagFieldNode() {
-        return this._formNode.querySelector('.target input');
+        return this._formNode.querySelector('input[name=target-tag]');
+    }
+
+    get _addAliasCheckboxNode() {
+        return this._formNode.querySelector('input[name=alias]');
     }
 }