diff --git a/doc/Type/DateTime.rakudoc b/doc/Type/DateTime.rakudoc
index ccaec3d06..5676e99ba 100644
--- a/doc/Type/DateTime.rakudoc
+++ b/doc/Type/DateTime.rakudoc
@@ -300,7 +300,7 @@ Returns the date and time as a POSIX/UNIX timestamp (integral seconds since the
 If C<$ignore-timezone> is C<True>, the C<DateTime> object will be treated as if
 the time zone offset is zero.
 
-    method posix(Bool:D: $ignore-timezone = False, :real --> Num:D)
+    method posix(Bool:D: $ignore-timezone = False, :$real --> Num:D)
 
 As of release 2022.06 of the Rakudo compiler, it is also possible to specify a
 C<:real> named argument.  If specified with a true value, a C<Num> will be