diff --git a/src/editor/setup.js b/src/editor/setup.js
index e30c8dd..eec6d98 100644
--- a/src/editor/setup.js
+++ b/src/editor/setup.js
@@ -55,6 +55,7 @@ const customSetup = /*@__PURE__*/(() => [
     drawSelection(),
     dropCursor(),
     EditorState.allowMultipleSelections.of(true),
+    EditorView.clickAddsSelectionRange.of(e => e.altKey),
     indentOnInput(),
     syntaxHighlighting(defaultHighlightStyle, { fallback: true }),
     bracketMatching(),