diff --git a/crates/typst-library/src/model/bibliography.rs b/crates/typst-library/src/model/bibliography.rs
index 7bfacfc66..8056d4ab3 100644
--- a/crates/typst-library/src/model/bibliography.rs
+++ b/crates/typst-library/src/model/bibliography.rs
@@ -90,7 +90,7 @@ use crate::World;
 /// ```
 #[elem(Locatable, Synthesize, Show, ShowSet, LocalName)]
 pub struct BibliographyElem {
-    /// One or multiple paths to or raw bytes for Hayagriva `.yml` and/or
+    /// One or multiple paths to or raw bytes for Hayagriva `.yaml` and/or
     /// BibLaTeX `.bib` files.
     ///
     /// This can be a:
@@ -385,7 +385,7 @@ fn decode_library(loaded: &Loaded) -> SourceResult<Library> {
                 .within(loaded),
             _ => bail!(
                 loaded.source.span,
-                "unknown bibliography format (must be .yml/.yaml or .bib)"
+                "unknown bibliography format (must be .yaml/.yml or .bib)"
             ),
         }
     } else {
diff --git a/docs/changelog/0.9.0.md b/docs/changelog/0.9.0.md
index 0cf3c1bd8..0a4ac8268 100644
--- a/docs/changelog/0.9.0.md
+++ b/docs/changelog/0.9.0.md
@@ -21,7 +21,7 @@ description: Changes in Typst 0.9.0
 - Added [`full`]($bibliography.full) argument to bibliography function to print
   the full bibliography even if not all works were cited
 - Bibliography entries can now contain Typst equations (wrapped in `[$..$]` just
-  like in markup), this works both for `.yml` and `.bib` bibliographies
+  like in markup), this works both for `.yaml` and `.bib` bibliographies
 - The hayagriva YAML format was improved. See its
   [changelog](https://github.com/typst/hayagriva/blob/main/CHANGELOG.md) for
   more details. **(Breaking change)**