diff --git a/bld/config_files/definition.xml b/bld/config_files/definition.xml
index b4bffa3ce4..179ab1b034 100644
--- a/bld/config_files/definition.xml
+++ b/bld/config_files/definition.xml
@@ -127,7 +127,7 @@ Chemistry source directory generated by the chemistry preprocessor; contains F90
 <entry id="chem_src_dir" value="">
 Chemistry source directory; contains F90 files.
 </entry>
-<entry id="ocn" valid_values="docn,dom,som,socn,aquaplanet,pop,mom" value="docn">
+<entry id="ocn" valid_values="docn,dom,som,socn,aquaplanet,pop,mom,mpaso" value="docn">
 Use data ocean model (docn or dom), stub ocean (socn), or aqua planet ocean
 (aquaplanet) in cam build.  When built from the CESM scripts the value of
 ocn may be set to pop.  This doesn't impact how CAM is built, only how