diff --git a/.htaccess b/.htaccess
index a473e58f2a..ccc4c14b8e 100644
--- a/.htaccess
+++ b/.htaccess
@@ -164,6 +164,9 @@ AddType text/x-vcard                        vcf
   </IfModule>
 
   # Compress all output labeled with one of the following MIME-types
+  # (for Apache versions below 2.3.7, you don't need to enable `mod_filter`
+  # and can remove the `<IfModule mod_filter.c>` and `</IfModule>` lines as
+  # `AddOutputFilterByType` is still in the core directives)
   <IfModule mod_filter.c>
     AddOutputFilterByType DEFLATE application/atom+xml \
                                   application/javascript \