diff --git a/df.units.xml b/df.units.xml
index 34a171b4b..37d9a5923 100644
--- a/df.units.xml
+++ b/df.units.xml
@@ -1245,8 +1245,8 @@
         <int32_t name='sheet_icon_texpos'/>
         <static-array name='texpos_currently_in_use' count='3'><static-array count='2' type-name='bool'/></static-array>
 
-        <int8_t name='unk_140a'/>
-        <int64_t name='unk_1410'/>
+        <int8_t name='cached_glowtile_type'/>
+        <int64_t name='pool_index'/> this should be size_t but we don't support size_t in structures yet
         <padding name='mtx' size='80'/> should be std::mutex
 
         <virtual-methods>