diff --git a/packages/shape-definitions/source/shapes/maid/Announcement.ttl b/packages/shape-definitions/source/shapes/maid/Announcement.ttl
new file mode 100644
index 0000000..b6d2a2a
--- /dev/null
+++ b/packages/shape-definitions/source/shapes/maid/Announcement.ttl
@@ -0,0 +1,7 @@
+PREFIX : <>
+PREFIX maid: <https://mutual-aid.app/ns/core#>
+PREFIX sh: <http://www.w3.org/ns/shacl#>
+
+:Announcement
+  a sh:NodeShape ;
+  sh:targetClass maid:Announcement .
diff --git a/packages/shape-definitions/source/shapetrees/maid/Announcement.ttl b/packages/shape-definitions/source/shapetrees/maid/Announcement.ttl
new file mode 100644
index 0000000..418ee39
--- /dev/null
+++ b/packages/shape-definitions/source/shapetrees/maid/Announcement.ttl
@@ -0,0 +1,12 @@
+PREFIX : <>
+PREFIX pair: <http://virtual-assembly.org/ontologies/pair#>
+PREFIX skos: <http://www.w3.org/2004/02/skos/core#>
+PREFIX st: <http://www.w3.org/ns/shapetrees#>
+
+:Announcement
+  a st:ShapeTree ;
+  st:expectsType st:Resource ;
+  st:shape <../../shapes/maid/Announcement> ;
+  st:describesInstance pair:label ;
+  skos:prefLabel "Announcement"@en, "Annonce"@fr ;
+  skos:definition "Information shared with other"@en, "Une information partagée"@fr .