diff --git a/lsp-mode.el b/lsp-mode.el
index d3e798cc48..a92dfa7e2c 100644
--- a/lsp-mode.el
+++ b/lsp-mode.el
@@ -3801,7 +3801,8 @@ disappearing, unset all the variables related to it."
                                                                            "command"
                                                                            "insertTextFormat"
                                                                            "insertTextMode"])))
-                                                        (insertTextModeSupport . ((valueSet . [1 2])))))
+                                                        (insertTextModeSupport . ((valueSet . [1 2])))
+                                                        (labelDetailsSupport . t)))
                                      (contextSupport . t)
                                      (dynamicRegistration . t)))
                       (signatureHelp . ((signatureInformation . ((parameterInformation . ((labelOffsetSupport . t)))))
diff --git a/lsp-protocol.el b/lsp-protocol.el
index 656e81f898..b8e2b62b8d 100644
--- a/lsp-protocol.el
+++ b/lsp-protocol.el
@@ -627,7 +627,7 @@ See `-let' for a description of the destructuring mechanism."
  (CompletionCapabilities nil (:completionItem :completionItemKind :contextSupport :dynamicRegistration))
  (CompletionContext (:triggerKind) (:triggerCharacter))
  (CompletionItem (:label) (:additionalTextEdits :command :commitCharacters :data :deprecated :detail :documentation :filterText :insertText :insertTextFormat :insertTextMode :kind :preselect :sortText :tags :textEdit :score :labelDetails))
- (CompletionItemCapabilities nil (:commitCharactersSupport :deprecatedSupport :documentationFormat :preselectSupport :snippetSupport :tagSupport :insertReplaceSupport :resolveSupport))
+ (CompletionItemCapabilities nil (:commitCharactersSupport :deprecatedSupport :documentationFormat :preselectSupport :snippetSupport :tagSupport :insertReplaceSupport :resolveSupport :labelDetailsSupport))
  (CompletionItemKindCapabilities nil (:valueSet))
  (CompletionItemTagSupportCapabilities (:valueSet) nil)
  (CompletionOptions nil (:resolveProvider :triggerCharacters :allCommitCharacters))