diff --git a/.changeset/perf-selectpanel-has-selector.md b/.changeset/perf-selectpanel-has-selector.md
new file mode 100644
index 00000000000..b7992e4c6ff
--- /dev/null
+++ b/.changeset/perf-selectpanel-has-selector.md
@@ -0,0 +1,7 @@
+---
+'@primer/react': patch
+---
+
+perf(SelectPanel): Document acceptable :has() selector usage
+
+Added documentation explaining why the :has(input:placeholder-shown) selector is acceptable.
diff --git a/packages/react/src/experimental/SelectPanel2/SelectPanel.module.css b/packages/react/src/experimental/SelectPanel2/SelectPanel.module.css
index 7689c6c9261..3ea6ebf6005 100644
--- a/packages/react/src/experimental/SelectPanel2/SelectPanel.module.css
+++ b/packages/react/src/experimental/SelectPanel2/SelectPanel.module.css
@@ -112,7 +112,12 @@
 .TextInput {
   padding-left: var(--base-size-8) !important;
 
-  /* stylelint-disable-next-line selector-class-pattern */
+  /*
+   * NOTE: Uses descendant :has() - input is not direct child of TextInputWrapper
+   * due to TextInputInnerVisualSlot wrappers. This is acceptable performance
+   * as the search is scoped to this single element's subtree.
+   */
+  /* stylelint-disable-next-line selector-class-pattern -- global class from TextInput */
   &:has(input:placeholder-shown) :global(.TextInput-action) {
     display: none;
   }