diff --git a/source/lib.rs b/source/lib.rs
index 75c3caa..8f15226 100644
--- a/source/lib.rs
+++ b/source/lib.rs
@@ -27,7 +27,7 @@ return the remaining contents of the string.
 This function will return an [`Err`] when:
 
 - the data doesn't have a frontmatter section,
-- the frontmatter isnt' at the beginning of the data.
+- the frontmatter isn't at the beginning of the data.
 
 ## Example