diff --git a/src/drivers/mct/cime_config/config_component.xml b/src/drivers/mct/cime_config/config_component.xml
index 7cf1b73a5de..f338d0f7521 100644
--- a/src/drivers/mct/cime_config/config_component.xml
+++ b/src/drivers/mct/cime_config/config_component.xml
@@ -2446,7 +2446,7 @@
 
   <entry id="HIST_OPTION">
     <type>char</type>
-    <valid_values></valid_values>
+    <valid_values>none,never,nsteps,nstep,nseconds,nsecond,nminutes,nminute,nhours,nhour,ndays,nday,nmonths,nmonth,nyears,nyear,date,ifdays0,end</valid_values>
     <default_value>never</default_value>
     <group>run_drv_history</group>
     <file>env_run.xml</file>
diff --git a/src/drivers/mct/cime_config/config_component_acme.xml b/src/drivers/mct/cime_config/config_component_acme.xml
index 0d8e73dfc52..3b85398b8fd 100644
--- a/src/drivers/mct/cime_config/config_component_acme.xml
+++ b/src/drivers/mct/cime_config/config_component_acme.xml
@@ -482,7 +482,7 @@
 
   <entry id="AVGHIST_OPTION">
     <type>char</type>
-    <valid_values></valid_values>
+    <valid_values>none,never,nsteps,nstep,nseconds,nsecond,nminutes,nminute,nhours,nhour,ndays,nday,nmonths,nmonth,nyears,nyear,date,ifdays0,end</valid_values>
     <default_value>never</default_value>
     <values match="last">
       <value compset="_DOCN%IAF">nmonths</value>
diff --git a/src/drivers/mct/cime_config/config_component_cesm.xml b/src/drivers/mct/cime_config/config_component_cesm.xml
index c857889bfa3..ad0cae5b0c4 100644
--- a/src/drivers/mct/cime_config/config_component_cesm.xml
+++ b/src/drivers/mct/cime_config/config_component_cesm.xml
@@ -396,7 +396,7 @@
 
   <entry id="AVGHIST_OPTION">
     <type>char</type>
-    <valid_values></valid_values>
+    <valid_values>none,never,nsteps,nstep,nseconds,nsecond,nminutes,nminute,nhours,nhour,ndays,nday,nmonths,nmonth,nyears,nyear,date,ifdays0,end</valid_values>
     <default_value>never</default_value>
     <values match="last">
       <value compset="_DOCN%IAF">nmonths</value>