diff --git a/.spi.yml b/.spi.yml
index c69bdd7..7d6cc46 100644
--- a/.spi.yml
+++ b/.spi.yml
@@ -9,9 +9,11 @@
 # available.
 version: 1
 # Overrides the author line SPI derives from the commit history, which still
-# credits the repository's former `gumob` handle.
+# credits the repository's former `gumob` handle. SPI renders this value
+# verbatim -- unlike the derived line, it gets no "Written by" prefix and no
+# full stop -- so the value has to be a complete sentence.
 metadata:
-  authors: Kojiro Futamura and contributors
+  authors: Written by Kojiro Futamura and contributors.
 builder:
   configs:
     - documentation_targets: [Punycode]
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4f2f6ac..90f2b29 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed
+
+- The author line on the Swift Package Index page reads as a sentence again. SPI renders `metadata.authors` from `.spi.yml` verbatim, without the "Written by" prefix and full stop it adds to the line it derives from the commit history, so the value now carries them itself.
+
 ## [4.0.2] - 2026-08-21
 
 ### Added