diff --git a/.adr/001-document-every-subdivision.md b/.adr/001-document-every-subdivision.md
new file mode 100644
index 000000000..6b134c1ea
--- /dev/null
+++ b/.adr/001-document-every-subdivision.md
@@ -0,0 +1,27 @@
+# Document empty subdivision
+
+## Status
+
+Accepted
+
+## Context
+
+This decision arises from the discussion on https://github.com/focus-shift/jollyday/pull/388, where the identification for subdivisions was changed to 'ISO 3166-2'. There was uncertainty regarding whether to include subdivisions that do not have additional holidays compared to the country.
+
+During the discussion, it was noted that having numerous subdivisions for a country like India while missing a few could lead to confusion and require significant time investment to identify the missing ones.
+
+## Decision
+
+The decision has been made to include all subdivisions, regardless of whether they have distinct holidays compared to the country.
+
+## Consequences
+
+For subdivisions without separate public holidays, an empty `SubConfigurations` will still be created. For instance, for `Ladākh`, it will appear as follows in the configuration:
+
+```xml
+  <SubConfigurations hierarchy="la" description="Ladākh">
+  <Holidays/>
+</SubConfigurations>
+```
+
+This ensures consistency and completeness in the documentation of subdivisions.
diff --git a/.adr/999-adr-template.md b/.adr/999-adr-template.md
new file mode 100644
index 000000000..c99907f0e
--- /dev/null
+++ b/.adr/999-adr-template.md
@@ -0,0 +1,19 @@
+# Decision record template
+
+# Title
+
+## Status
+
+What is the status, such as proposed, accepted, rejected, deprecated, superseded, etc.?
+
+## Context
+
+What is the issue that we're seeing that is motivating this decision or change?
+
+## Decision
+
+What is the change that we're proposing and/or doing?
+
+## Consequences
+
+What becomes easier or more difficult to do because of this change?
diff --git a/.adr/README.md b/.adr/README.md
new file mode 100644
index 000000000..4fbed7e60
--- /dev/null
+++ b/.adr/README.md
@@ -0,0 +1,11 @@
+# Architecture decision record (ADR)
+
+Welcome to the directory dedicated to housing the defined architectural decisions for Jollyday.
+
+For further insights and details, please refer to the [ADR List] provided in the top-level README document.
+
+Additionally, if you wish to utilize our standardized template for recording architectural decisions,
+it is conveniently accessible at [ADR Template].
+
+[ADR List]: ../README.md
+[ADR Template]: 999-adr-template.md
diff --git a/README.md b/README.md
index 18bc30528..8299c1d65 100644
--- a/README.md
+++ b/README.md
@@ -212,23 +212,9 @@ If you want to raise an **issue or bug** you can create a [new issue](https://gi
 
 * [JDK 11](https://openjdk.java.net/install/)
 
-### Clone the repository
+### Architecture decision record (ADR)
 
-```bash
-git clone git@github.com:focus-shift/jollyday.git
-```
-
-### Build jollyday
-
-```bash
-./mvnw clean verify
-```
-
-or for Windows user:
-
-```bash
-./mvnw.cmd clean verify
-```
+ * [Document empty subdivision](.adr/001-document-every-subdivision.md)
 
 ## License