diff --git a/public/img/logos/addy.io.svg b/public/img/logos/addy.io.svg
new file mode 100644
index 0000000..5842f46
--- /dev/null
+++ b/public/img/logos/addy.io.svg
@@ -0,0 +1,257 @@
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diff --git a/src/data/signatures.yaml b/src/data/signatures.yaml
index 7dca74d..e592878 100644
--- a/src/data/signatures.yaml
+++ b/src/data/signatures.yaml
@@ -4,6 +4,10 @@
 #  poc: ""
 #  region: ""
 
+- organization: "addy.io"
+  url: "addy.io"
+  poc: "Will Browning <contact@help.addy.io>"
+  region: "GB"
 - organization: "AdGuard"
   url: "adguard.com"
   poc: "Daria Magdik <daria@adguard.com>"
diff --git a/src/pages/open-letter.astro b/src/pages/open-letter.astro
index 8ea8690..9baefd0 100644
--- a/src/pages/open-letter.astro
+++ b/src/pages/open-letter.astro
@@ -21,7 +21,7 @@ function regionFlag(code?: string): string {
 }
 
 // Logos stored as SVG for these domains; all others are PNG
-const svgLogos = new Set(["appfair.org", "auroraoss.com", "guardianproject.info", "fastmail.com", "jmp.chat", "kde.org", "osmfoundation.org", "molly.im"]);
+const svgLogos = new Set(["addy.io", "appfair.org", "auroraoss.com", "guardianproject.info", "fastmail.com", "jmp.chat", "kde.org", "osmfoundation.org", "molly.im"]);
 function logoPath(url: string): string {
   const ext = svgLogos.has(url) ? "svg" : "png";
   return `/img/logos/${url}.${ext}`;