diff --git a/llvm/utils/kate/llvm.xml b/llvm/utils/kate/llvm.xml
--- a/llvm/utils/kate/llvm.xml
+++ b/llvm/utils/kate/llvm.xml
@@ -68,6 +68,7 @@
       <item> zeroext </item>
       <item> signext </item>
       <item> inreg </item>
+      <item> byref </item>
       <item> byval </item>
       <item> sret </item>
       <item> noalias </item>
diff --git a/llvm/utils/vim/syntax/llvm.vim b/llvm/utils/vim/syntax/llvm.vim
--- a/llvm/utils/vim/syntax/llvm.vim
+++ b/llvm/utils/vim/syntax/llvm.vim
@@ -55,6 +55,7 @@
       \ available_externally
       \ blockaddress
       \ builtin
+      \ byref
       \ byval
       \ c
       \ catch
diff --git a/llvm/utils/vscode/llvm/syntaxes/ll.tmLanguage.yaml b/llvm/utils/vscode/llvm/syntaxes/ll.tmLanguage.yaml
--- a/llvm/utils/vscode/llvm/syntaxes/ll.tmLanguage.yaml
+++ b/llvm/utils/vscode/llvm/syntaxes/ll.tmLanguage.yaml
@@ -152,6 +152,7 @@
             \\bavailable_externally\\b|\
             \\bblockaddress\\b|\
             \\bbuiltin\\b|\
+            \\bbyref\\b|\
             \\bbyval\\b|\
             \\bc\\b|\
             \\bcatch\\b|\