diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,3 +1,7 @@
 # skychart
 
-Automatically requested module for rpms/skychart:stable.
\ No newline at end of file
+This is the module definition for Skychart.
+
+Skychart is a rapidly developing project upstream. Usually there is a new development release every week and much rare stable releases with rare backports.
+
+Here on Fedora we will have one Devel module branch and at least one module branch which stays in the latest stable release. Stable modules will start with the upcoming 4.2 release.
diff --git a/skychart.yaml b/skychart.yaml
new file mode 100644
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+++ b/skychart.yaml
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+document: modulemd
+version: 2
+data:
+  summary: Planetarium software for the advanced amateur astronomer
+  description: >-
+    This program enables you to draw sky charts, making use of the data in 16 catalogs
+    of stars and nebulae. In addition the position of planets, asteroids and comets
+    are shown.
+
+    The purpose of this program is to prepare different sky maps for a particular
+    observation. A large number of parameters help you to choose specifically or automatically
+    which catalogs to use, the colour and the dimension of stars and nebulae, the
+    representation of planets, the display of labels and coordinate grids, the superposition
+    of pictures, the condition of visibility and more. All these features make this
+    celestial atlas more complete than a conventional planetarium.
+  license:
+    module:
+    - MIT
+  dependencies:
+  - buildrequires:
+      platform: []
+    requires:
+      platform: []
+  profiles:
+      default:
+          description: Minimal installation with default catalogs and documentation.
+          rpms:
+              - skychart
+              - skychart-doc
+      additional-stars:
+          description: Core program, documentation and additional star catalogs.
+          rpms:
+              - skychart
+              - skychart-doc
+              - skychart-data-stars
+      additional-dso:
+          description: Core program, documentation and additional Deep Sky catalogs.
+          rpms:
+              - skychart
+              - skychart-doc
+              - skychart-data-dso
+      full:
+          description: Core program, documentation and all available additional catalogs.
+          rpms:
+              - skychart
+              - skychart-doc
+              - skychart-data-stars
+              - skychart-data-dso
+  api:
+    rpms:
+        - skychart
+        - skychart-doc
+        - skychart-data-stars
+        - skychart-data-dso
+  components:
+    rpms:
+      skychart:
+        ref: devel
+        rationale: Main package