Breaking change correction (#44695)

* fixes #43828

* whoops extra line

Author: Cam Soper

docs/core/compatibility/10.0.md

@@ -35,9 +35,10 @@ If you're migrating an app to .NET 10, the breaking changes listed here might af
 
 ## Cryptography
 
-| Title                                                                                                  | Type of change    | Introduced version |
-|--------------------------------------------------------------------------------------------------------|-------------------|--------------------|
-| [X500DistinguishedName validation is stricter](cryptography/10.0/x500distinguishedname-validation.md)  | Behavioral change | Preview 1          |
+| Title                                                                                                      | Type of change    | Introduced version |
+|------------------------------------------------------------------------------------------------------------|-------------------|--------------------|
+| [X500DistinguishedName validation is stricter](cryptography/10.0/x500distinguishedname-validation.md)      | Behavioral change | Preview 1          |
+| [Environment variable renamed to DOTNET_OPENSSL_VERSION_OVERRIDE](cryptography/10.0/version-override.md)   | Behavioral change | Preview 1          |
 
 ## Windows Forms
 

docs/core/compatibility/cryptography/10.0/version-override.md

@@ -0,0 +1,38 @@
+---
+title: "Breaking change: Environment variable renamed to DOTNET_OPENSSL_VERSION_OVERRIDE"
+description: Learn about the .NET 10 breaking change in .NET cryptography where the environment variable CLR_OPENSSL_VERSION_OVERRIDE was renamed to DOTNET_OPENSSL_VERSION_OVERRIDE.
+ms.date: 02/05/2025
+ai-usage: ai-assisted
+---
+
+# Environment variable renamed to DOTNET_OPENSSL_VERSION_OVERRIDE
+
+.NET previously supported a configuration-switch environment variable called `CLR_OPENSSL_VERSION_OVERRIDE`, which allowed users to specify the preferred OpenSSL library version for apps running on Linux. In .NET 10, this environment variable has been renamed to `DOTNET_OPENSSL_VERSION_OVERRIDE` to align with the naming convention of other configuration switch environment variables in .NET.
+
+## Previous behavior
+
+The `CLR_OPENSSL_VERSION_OVERRIDE` environment variable was used to specify the preferred OpenSSL version to be loaded in the application.
+
+## New behavior
+
+The `DOTNET_OPENSSL_VERSION_OVERRIDE` environment variable is used to specify the preferred OpenSSL version to be loaded in the application.
+
+## Version introduced
+
+.NET 10 Preview 1
+
+## Type of breaking change
+
+This change is a [behavioral change](../../categories.md#behavioral-change).
+
+## Reason for change
+
+This change ensures the environment variable is consistent with the naming convention used for all [.NET environment variables](../../../tools/dotnet-environment-variables.md).
+
+## Recommended action
+
+If you have a .NET 10 app that previously used the `CLR_OPENSSL_VERSION_OVERRIDE` environment variable, use `DOTNET_OPENSSL_VERSION_OVERRIDE` instead.
+
+## Affected APIs
+
+N/A

docs/core/compatibility/toc.yml

@@ -26,6 +26,8 @@ items:
             items:
               - name: X500DistinguishedName validation is stricter
                 href: cryptography/10.0/x500distinguishedname-validation.md
+              - name: Environment variable renamed to DOTNET_OPENSSL_VERSION_OVERRIDE
+                href: cryptography/10.0/version-override.md
           - name: Globalization
             items:
               - name: Environment variable renamed to DOTNET_ICU_VERSION_OVERRIDE
@@ -1584,6 +1586,8 @@ items:
             items:
               - name: X500DistinguishedName validation is stricter
                 href: cryptography/10.0/x500distinguishedname-validation.md
+              - name: Environment variable renamed to DOTNET_OPENSSL_VERSION_OVERRIDE
+                href: cryptography/10.0/version-override.md
           - name: .NET 9
             items:
               - name: SafeEvpPKeyHandle.DuplicateHandle up-refs the handle