diff --git a/crates/typst-pdf/src/lib.rs b/crates/typst-pdf/src/lib.rs
index 4e0b74308..88c6ee552 100644
--- a/crates/typst-pdf/src/lib.rs
+++ b/crates/typst-pdf/src/lib.rs
@@ -172,7 +172,7 @@ pub enum PdfStandard {
     /// PDF/A-2u.
     #[serde(rename = "a-2u")]
     A_2u,
-    /// PDF/A-3u.
+    /// PDF/A-3b.
     #[serde(rename = "a-3b")]
     A_3b,
     /// PDF/A-3u.