diff --git a/csl/ieee.csl b/csl/ieee.csl
index c6d816059..5168f537e 100644
--- a/csl/ieee.csl
+++ b/csl/ieee.csl
@@ -11,6 +11,7 @@
         </author>
         <category term="engineering"/>
         <category term="generic-base"/>
+        <category term="numeric"/>
         <updated></updated>
     </info>
     <macro name="author">
diff --git a/csl/mla.csl b/csl/mla.csl
index 32b1e9b3d..75d751212 100644
--- a/csl/mla.csl
+++ b/csl/mla.csl
@@ -10,6 +10,7 @@
       <email>simon@simonster.com</email>
     </author>
     <category term="generic-base"/>
+    <category term="author-date"/>
     <updated></updated>
   </info>
   <macro name="editor-translator">
diff --git a/csl/nature.csl b/csl/nature.csl
index 5a276ba50..7bbe6a5a7 100644
--- a/csl/nature.csl
+++ b/csl/nature.csl
@@ -11,6 +11,7 @@
         </author>
         <category term="biology"/>
         <category term="generic-base"/>
+        <category term="numeric"/>
         <updated></updated>
     </info>
     <macro name="author">
diff --git a/csl/nlm.csl b/csl/nlm.csl
index 11c849fa1..7f1e66885 100644
--- a/csl/nlm.csl
+++ b/csl/nlm.csl
@@ -10,6 +10,7 @@
             <email>mberkowi@gmu.edu</email>
         </author>
         <category term="generic-base"/>
+	<category term="numeric"/>
         <updated></updated>
     </info>
     <macro name="author">
diff --git a/csl/science.csl b/csl/science.csl
index edf5dd067..42de5c0cc 100644
--- a/csl/science.csl
+++ b/csl/science.csl
@@ -8,7 +8,7 @@
       <name>Julian Onions</name>
       <email>julian.onions@gmail.com</email>
     </author>
-    <category term="author-date"/>
+    <category term="numeric"/>
     <category term="science"/>
     <updated/>
     <summary>The Science journal style.</summary>