diff --git a/crates/ruma-serde/src/lib.rs b/crates/ruma-serde/src/lib.rs
index 0d760905..4b2e5ea6 100644
--- a/crates/ruma-serde/src/lib.rs
+++ b/crates/ruma-serde/src/lib.rs
@@ -51,7 +51,7 @@ pub fn default_true() -> bool {
 
 /// Simply dereferences the given bool.
 ///
-/// Useful for `#[serde(skip_serializing_if = ...)]`
+/// Useful for `#[serde(skip_serializing_if = ...)]`.
 #[allow(clippy::trivially_copy_pass_by_ref)]
 pub fn is_true(b: &bool) -> bool {
     *b