diff --git a/fmt/string.h b/fmt/string.h
index f50d8b45..31c7e9d9 100644
--- a/fmt/string.h
+++ b/fmt/string.h
@@ -20,6 +20,8 @@ namespace fmt {
 
   **Example**::
 
+    #include "fmt/string.h"
+
     std::string answer = fmt::to_string(42);
   \endrst
  */