diff --git a/runtime/doc/builtin.txt b/runtime/doc/builtin.txt
index 717f13a..a15a20a 100644
--- a/runtime/doc/builtin.txt
+++ b/runtime/doc/builtin.txt
@@ -1,4 +1,4 @@
-*builtin.txt*	For Vim version 9.1.  Last change: 2025 May 14
+*builtin.txt*	For Vim version 9.1.  Last change: 2025 May 28
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -2007,6 +2007,7 @@
 		   "omni"	     Omni completion |i_CTRL-X_CTRL-O|
 		   "spell"	     Spelling suggestions |i_CTRL-X_s|
 		   "eval"	     |complete()| completion
+		   "register"	     Words from registers |i_CTRL-X_CTRL-R|
 		   "unknown"	     Other internal modes
 
 		If the optional {what} list argument is supplied, then only
diff --git a/src/testdir/test_ins_complete.vim b/src/testdir/test_ins_complete.vim
index 4bb8b40..dfc2189 100644
--- a/src/testdir/test_ins_complete.vim
+++ b/src/testdir/test_ins_complete.vim
@@ -4641,6 +4641,9 @@
   call feedkeys("a\<C-X>\<C-R>\<Esc>", 'tx')
   call assert_equal("zero", getline(1))
 
+  call feedkeys("Sze\<C-X>\<C-R>\<C-R>=string(complete_info(['mode']))\<CR>\<ESC>", "tx")
+  call assert_equal("zero{'mode': 'register'}", getline(1))
+
   " Clean up
   bwipe!
   delfunc GetItems
diff --git a/src/version.c b/src/version.c
index 6941380..3885bcb 100644
--- a/src/version.c
+++ b/src/version.c
@@ -710,6 +710,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1417,
+/**/
     1416,
 /**/
     1415,