diff --git a/eng/doc/SupportedPlatforms.md b/eng/doc/SupportedPlatforms.md
index 124334b5bf2..6fa1696f042 100644
--- a/eng/doc/SupportedPlatforms.md
+++ b/eng/doc/SupportedPlatforms.md
@@ -29,6 +29,7 @@ The following OpenSSL versions are supported on Linux platforms:
 
 - OpenSSL 1.1.1
 - OpenSSL 3.x (built-in providers, or SymCrypt provider v1.6.1+)
+- OpenSSL 4.x (built-in providers, or SymCrypt provider v1.6.1+) (since Go 1.28)
 
 ## Getting Help
 
diff --git a/eng/doc/fips/README.md b/eng/doc/fips/README.md
index 1aca7e11bc4..d6bf6ac0d1a 100644
--- a/eng/doc/fips/README.md
+++ b/eng/doc/fips/README.md
@@ -327,6 +327,7 @@ The `libcrypto` shared library file name varies among different platforms, so a
 
 - The base name is always `libcrypto.so.`
 - Well-known version strings are appended to the base name in this order:
+  - Since Go 1.28: `3` -> `4` -> `1.1` -> `11` -> `111`.
   - Since Go 1.25: `3` -> `1.1` -> `11` -> `111`.
   - Prior to Go 1.25: `3` -> `1.1` -> `11` -> `111` -> `1.0.2` -> `1.0.0`.
 - This may find multiple libraries installed on the machine, so to pick one:
@@ -461,6 +462,10 @@ A program running in FIPS mode can claim it is using a FIPS-certified cryptograp
 
 This list of major changes is intended for quick reference and for access to historical information about versions that are no longer supported. The behavior of all in-support versions are documented in the sections above with notes for version-specific differences where necessary.
 
+### Go 1.28 (Feb 2027)
+
+- The OpenSSL backend supports OpenSSL 4.
+
 ### Go 1.27 (Aug 2026)
 
 - Support for `GODEBUG=fips140=only` has been added. It acts as `fips140=on`, but also panics if a non-FIPS-approved algorithm is used.