diff --git a/Readme.md b/Readme.md
index ae683a5..15cb385 100644
--- a/Readme.md
+++ b/Readme.md
@@ -22,6 +22,15 @@ while most others are top-level. This is part of a long-standing refactoring sta
 when we merged https://github.com/ooni/probe-engine into this repository. We'll slowly
 ensure that all packages inside `engine` are moved out of it and inside `internal`.
 
+## Semantic versioning policy
+
+The mobile library is a public package for technical reasons. Go mobile tools require
+a public package to build from. Yet, we don't consider API breakages happening in
+such a package to be sufficient to bump our major version number. For us, the mobile
+library is just a mean to implement OONI Probe Android and OONI Probe iOS. We'll
+only bump the major version number if we implement any set of breaking changes of
+the `./cmd/ooniprobe`'s CLI.
+
 ## License
 
 ```
diff --git a/pkg/oonimkall/task.go b/pkg/oonimkall/task.go
index 5eec0a0..27853d1 100644
--- a/pkg/oonimkall/task.go
+++ b/pkg/oonimkall/task.go
@@ -9,6 +9,14 @@
 // reimplementation of the mkall API implemented by Measurement Kit
 // in, e.g., https://github.com/measurement-kit/mkall-ios.
 //
+// Semantic versioning policy
+//
+// This package is public for technical reasons. We cannot use `go
+// mobile` on a private package. Yet, we are not going to bump this
+// repository's major number in case we change oonimkall's API. We
+// consider this package our private API for interfacing with our
+// mobile applications for Android and iOS.
+//
 // Task API
 //
 // The basic tenet of the task API is that you define an experiment