diff --git a/p4-16/spec/P4-16-spec.adoc b/p4-16/spec/P4-16-spec.adoc
index 1bb69c49c8..d50bdec6f7 100644
--- a/p4-16/spec/P4-16-spec.adoc
+++ b/p4-16/spec/P4-16-spec.adoc
@@ -1,5 +1,6 @@
 = P4~16~ Language Specification : The P4 Language Consortium
 :doctype: book
+:revdate: {docdate}
 :revnumber: v1.2.5
 :imagesdir: resources/figs
 :font-size: 10
diff --git a/p4-16/spec/resources/fonts/verify-font b/p4-16/spec/resources/fonts/verify-font
new file mode 100644
index 0000000000..c163d51d12
--- /dev/null
+++ b/p4-16/spec/resources/fonts/verify-font
@@ -0,0 +1,5 @@
+require 'ttfunk'
+require 'ttfunk/subset_collection'
+
+ttf_subsets = TTFunk::SubsetCollection.new TTFunk::File.open ARGV[0]
+(0...(ttf_subsets.instance_variable_get :@subsets).size).each {|idx| ttf_subsets[idx].encode }
\ No newline at end of file