diff --git a/src/json-crdt-peritext-ui/events/PeritextEventDefaults.ts b/src/json-crdt-peritext-ui/events/PeritextEventDefaults.ts
index adc5c14338..01ff7d6b95 100644
--- a/src/json-crdt-peritext-ui/events/PeritextEventDefaults.ts
+++ b/src/json-crdt-peritext-ui/events/PeritextEventDefaults.ts
@@ -1,5 +1,6 @@
 import type {Peritext} from '../../json-crdt-extensions/peritext';
 import type {EditorSlices} from '../../json-crdt-extensions/peritext/editor/EditorSlices';
+import {Anchor} from '../../json-crdt-extensions/peritext/rga/constants';
 import {CursorAnchor} from '../../json-crdt-extensions/peritext/slice/constants';
 import type {PeritextEventHandlerMap, PeritextEventTarget} from './PeritextEventTarget';
 import type * as events from './types';
@@ -99,7 +100,7 @@ export class PeritextEventDefaults implements PeritextEventHandlerMap {
   };
 
   public readonly inline = (event: CustomEvent<events.InlineDetail>) => {
-    const {type, store = 'saved', behavior = 'overwrite', data, pos} = event.detail;
+    const {type, store = 'saved', behavior = 'overwrite', data} = event.detail;
     const editor = this.txt.editor;
     const slices: EditorSlices = store === 'saved' ? editor.saved : store === 'extra' ? editor.extra : editor.local;
     switch (behavior) {
@@ -110,6 +111,18 @@ export class PeritextEventDefaults implements PeritextEventHandlerMap {
         slices.insErase(type, data);
         break;
       default:
+        for (let i = editor.cursors0(), cursor = i(); cursor; cursor = i()) {
+          // For inline boolean slices, ref endpoint "before" the next character
+          // as per the Peritext paper, so that, say, bold text automatically
+          // includes the next character typed.
+          if (cursor.end.anchor !== Anchor.Before || cursor.start.anchor !== Anchor.Before) {
+            const start = cursor.start.clone();
+            const end = cursor.end.clone();
+            start.refBefore();
+            end.refBefore();
+            cursor.set(start, end);
+          }
+        }
         slices.insOverwrite(type, data);
     }
   };