Add note to README.md

README.md

@@ -21,7 +21,8 @@
 6. [Environment variables]
 7. [Limitations]
 8. [Tips and tricks]
-9. [License]
+9. [Semantic versioning policy]
+10. [License]
 
 ## Installation
 
@@ -495,6 +496,10 @@ These options are incompatible in the following sense. If a fuzz target's argume
 
 - [Serde attributes] can be helpful in implementing `serde::Serialize`/`serde::Deserialize` for difficult types.
 
+## Semantic versioning policy
+
+We reserve the right to change the format of corpora, crashes, hangs, and work queues, and to consider such changes non-breaking.
+
 ## License
 
 `test-fuzz` is licensed and distributed under the AGPLv3 license with the [Macros and Inline Functions Exception]. In plain language, using the [`test_fuzz` macro], the [`test_fuzz_impl` macro], or `test-fuzz`'s [convenience functions and macros] in your software does not require it to be covered by the AGPLv3 license.