diff --git a/metadata.dtd b/metadata.dtd
index c36242a..6546dc6 100644
--- a/metadata.dtd
+++ b/metadata.dtd
@@ -56,7 +56,7 @@
     <!ELEMENT bugs-to (#PCDATA)>
     <!-- specify a type of package identification tracker -->
     <!ELEMENT remote-id (#PCDATA)>
-      <!ATTLIST remote-id type (bitbucket|cpan|cpan-module|cpe|cran|ctan|freedesktop-gitlab|gentoo|github|gitlab|gnome-gitlab|google-code|hackage|heptapod|launchpad|osdn|pear|pecl|pypi|rubygems|savannah|savannah-nongnu|sourceforge|sourcehut|vim) #REQUIRED>
+      <!ATTLIST remote-id type (apache|bitbucket|cpan|cpan-module|cpe|cran|ctan|freedesktop-gitlab|gentoo|github|gitlab|gnome-gitlab|google-code|hackage|heptapod|launchpad|osdn|pear|pecl|pypi|rubygems|savannah|savannah-nongnu|sourceforge|sourcehut|vim) #REQUIRED>
 
   <!-- category/package information for cross-linking in descriptions
     and useflag descriptions -->