diff --git a/resources/android/TextRenderer.kt b/resources/android/TextRenderer.kt
index 0ca11ac..ce546c4 100644
--- a/resources/android/TextRenderer.kt
+++ b/resources/android/TextRenderer.kt
@@ -248,7 +248,8 @@ private fun resolveFontStyle(style: Int): FontStyle {
 }
 
 // 0/absent = default (sans); only override for serif/mono so a custom default
-// font isn't clobbered.
+// font isn't clobbered. 3 (`font-rounded`) has no system face on Android and
+// keeps the default, like iOS designs Compose can't draw.
 private fun resolveFontFamily(family: Int): FontFamily? = when (family) {
     1 -> FontFamily.Serif
     2 -> FontFamily.Monospace
diff --git a/resources/ios/NativeUITextRenderer.swift b/resources/ios/NativeUITextRenderer.swift
index 318ecb7..1414fc2 100644
--- a/resources/ios/NativeUITextRenderer.swift
+++ b/resources/ios/NativeUITextRenderer.swift
@@ -287,6 +287,7 @@ struct NativeUITextRenderer: View {
         switch family {
         case 1: return .serif
         case 2: return .monospaced
+        case 3: return .rounded
         default: return .default
         }
     }