diff --git a/android-holder-tutorial-sample-app/repo/README.md b/android-holder-tutorial-sample-app/repo/README.md
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@@ -0,0 +1,15 @@
+# Local SDK repository
+
+This folder is the local Maven repository for the MATTR mDocs Holder SDK. It is
+referenced from `settings.gradle.kts` as `maven { url = uri("repo") }`.
+
+To set up the SDK:
+
+1. Unzip the `mobile-credential-holder-<version>.zip` package supplied by MATTR.
+2. Drag the unzipped `global` folder into this `repo` folder, so the layout is
+   `repo/global/...`.
+3. Sync the project with Gradle files to pick up the new module.
+
+> The SDK contents (`repo/global/`) are intentionally excluded from version
+> control via `.gitignore`. This README keeps the otherwise-empty `repo` folder
+> present after cloning or downloading the project.
diff --git a/android-in-person-verifier-tutorial-sample-app/repo/README.md b/android-in-person-verifier-tutorial-sample-app/repo/README.md
new file mode 100644
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+++ b/android-in-person-verifier-tutorial-sample-app/repo/README.md
@@ -0,0 +1,15 @@
+# Local SDK repository
+
+This folder is the local Maven repository for the MATTR mDocs Verifier SDK. It is
+referenced from `settings.gradle.kts` as `maven { url = uri("repo") }`.
+
+To set up the SDK:
+
+1. Unzip the `mobile-credential-verifier-<version>.zip` package supplied by MATTR.
+2. Drag the unzipped `global` folder into this `repo` folder, so the layout is
+   `repo/global/...`.
+3. Sync the project with Gradle files to pick up the new module.
+
+> The SDK contents (`repo/global/`) are intentionally excluded from version
+> control via `.gitignore`. This README keeps the otherwise-empty `repo` folder
+> present after cloning or downloading the project.
diff --git a/android-remote-verification-tutorial-sample-app/repo/README.md b/android-remote-verification-tutorial-sample-app/repo/README.md
new file mode 100644
index 0000000..2b4a7c3
--- /dev/null
+++ b/android-remote-verification-tutorial-sample-app/repo/README.md
@@ -0,0 +1,15 @@
+# Local SDK repository
+
+This folder is the local Maven repository for the MATTR mDocs Verifier SDK. It is
+referenced from `settings.gradle.kts` as `maven { url = uri("repo") }`.
+
+To set up the SDK:
+
+1. Unzip the `mobile-credential-verifier-<version>.zip` package supplied by MATTR.
+2. Drag the unzipped `global` folder into this `repo` folder, so the layout is
+   `repo/global/...`.
+3. Sync the project with Gradle files to pick up the new module.
+
+> The SDK contents (`repo/global/`) are intentionally excluded from version
+> control via `.gitignore`. This README keeps the otherwise-empty `repo` folder
+> present after cloning or downloading the project.