diff --git a/df.history.xml b/df.history.xml
index c8e0d2c23..d383a447d 100644
--- a/df.history.xml
+++ b/df.history.xml
@@ -2515,10 +2515,10 @@
       <int32_t name='entity' ref-target='historical_entity' comment='the guild to which the figure belongs?'/>
       <int32_t name='source_site' ref-target='world_site'/>
       <int32_t name='dest_site' ref-target='world_site'/>
-      <int32_t/>
-      <int32_t/>
-      <int32_t/>
-      <int32_t comment='value of the trade?'/>
+      <int32_t name='unk_v47_1' comment='Somehow connected to traded item, but not mat type/index'/>
+      <int32_t name='unk_v47_2' comment='Somehow connected to traded item, but not mat type/index'/>
+      <int32_t name='unk_v47_3' comment='Somehow connected to traded item, but not mat type/index'/>
+      <int32_t name='profit'/>
     </class-type>
 
     <class-type type-name='history_event_add_entity_site_profile_flagst' inherits-from='history_event' since='v0.47.01'>
@@ -2529,7 +2529,7 @@
     <class-type type-name='history_event_add_hf_entity_honorst' inherits-from='history_event' since='v0.47.01'>
       <int32_t name='entity_id' ref-target='historical_entity'/>
       <int32_t name='hfid' ref-target='historical_figure'/>
-      <int32_t name='honor_id' comment='Name from XML. Currently unknown what it references'/>
+      <int32_t name='honor_id' comment='index into historical_entity.honors'/>
     </class-type>
 
     <class-type type-name='history_event_gamblest' inherits-from='history_event' since='v0.47.01'>
@@ -2542,10 +2542,10 @@
 
     <class-type type-name='history_event_entity_dissolvedst' inherits-from='history_event' since='v0.47.01'>
       <int32_t name='entity' ref-target='historical_entity'/>
-      <int32_t name='unk_v47_1' comment="Wouldn't be surprised if unk_v47_1, unk_v47_2, and parameter have similar roles as in unit thoughts"/>
-      <int32_t name='unk_v47_2'/>
+      <enum base-type='int32_t' name='circumstance' type-name='unit_thought_type' init-value='None'/>
+      <int32_t name='circumstance_id' init-value='-1'/>
       <int32_t name='reason' ref-targe='history_event_reason'/>
-      <int32_t name='parameter' init-value='-1' comment="Type probably dependent on reason (with 40 it's a hfid)"/>
+      <int32_t name='reason_id' init-value='-1'/>
     </class-type>
 
     <class-type type-name='history_event_entity_equipment_purchasest' inherits-from='history_event' since='v0.47.01'>
@@ -2558,7 +2558,7 @@
 
     <class-type type-name='history_event_modified_buildingst' inherits-from='history_event' since='v0.47.01'>
       <int32_t name='site' ref-target='world_site'/>
-      <int32_t name='structure'/>
+      <int32_t name='structure' comment='index into world_site.buildings'/>
       <int32_t name='hf' ref-target='historical_figure'/>
       <int32_t/> always 12? maybe a reason? history_event_reason::great_fortresses_built_and_tested
       <bitfield name='extension_type' base-type='uint32_t'>