diff --git a/README.third_party.md b/README.third_party.md
index 64684ecc3aa..359b4a6004e 100644
--- a/README.third_party.md
+++ b/README.third_party.md
@@ -29,7 +29,7 @@ a notice will be included in
 | [fmt]                      | BSD-2-Clause      | 7.1.3             |                      |                ✗                |
 | [GPerfTools]               | BSD-3-Clause      | 2.9.1             |                      |                ✗                |
 | [ICU4]                     | ICU               | 57.1              |          ✗           |                ✗                |
-| [immer]                    | BSL-1.0           | d98a68c           |                      |                ✗                |
+| [immer]                    | BSL-1.0           | d98a68c + changes |                      |                ✗                |
 | [Intel Decimal FP Library] | BSD-3-Clause      | 2.0 Update 1      |                      |                ✗                |
 | [JSON-Schema-Test-Suite]   | MIT               | 728066f9c5        |                      |                                 |
 | [kms-message]              |                   | 1.0.1             |                      |                ✗                |