diff --git a/libc/bionic/wchar.cpp b/libc/bionic/wchar.cpp
index d28888d..7717e10 100644
--- a/libc/bionic/wchar.cpp
+++ b/libc/bionic/wchar.cpp
@@ -61,7 +61,7 @@
   static mbstate_t __private_state;
   mbstate_t* state = (ps == NULL) ? &__private_state : ps;
 
-  // Our wchar_t is UTF-32
+  // Our wchar_t is UTF-32.
   return mbrtoc32(reinterpret_cast<char32_t*>(pwc), s, n, state);
 }