diff --git a/compiler/rustc_span/src/hygiene.rs b/compiler/rustc_span/src/hygiene.rs
index 942c6648340..fe500355c1e 100644
--- a/compiler/rustc_span/src/hygiene.rs
+++ b/compiler/rustc_span/src/hygiene.rs
@@ -702,7 +702,7 @@ pub struct ExpnData {
     /// The `DefId` of the macro being invoked,
     /// if this `ExpnData` corresponds to a macro invocation
     pub macro_def_id: Option<DefId>,
-    /// The crate that originally created this `ExpnData. During
+    /// The crate that originally created this `ExpnData`. During
     /// metadata serialization, we only encode `ExpnData`s that were
     /// created locally - when our serialized metadata is decoded,
     /// foreign `ExpnId`s will have their `ExpnData` looked up