diff --git a/doc/api.md b/doc/api.md
index 1660ad7f..61e5c3de 100644
--- a/doc/api.md
+++ b/doc/api.md
@@ -79,6 +79,8 @@ time formatting and [`fmt/std.h`](#std-api) for other standard library types.
 
 There are two ways to make a user-defined type formattable: providing a
 `format_as` function or specializing the `formatter` struct template.
+Formatting of non-void pointer types is intentionally disallowed and they
+cannot be made formattable via either extension API.
 
 Use `format_as` if you want to make your type formattable as some other
 type with the same format specifiers. The `format_as` function should