diff --git a/headers/data/literals.h b/headers/data/literals.h
index a977f4f4..f231fef0 100644
--- a/headers/data/literals.h
+++ b/headers/data/literals.h
@@ -11,6 +11,9 @@ extern const struct data_processing_instruction PARTNER_START_LEVEL;
 // Overlay 0
 extern const struct data_processing_instruction TOP_MENU_MUSIC_ID;
 
+// Overlay 10
+extern const struct data_processing_instruction DEFEAT_ITEM_LOSS_CHANCE;
+
 // Overlay 29
 extern const struct data_processing_instruction NECTAR_IQ_BOOST;
 extern const struct data_processing_instruction COMPRESSED_SPRITE_BUFFER_SIZE;
diff --git a/symbols/literals.yml b/symbols/literals.yml
index 65a7d011..f270967d 100644
--- a/symbols/literals.yml
+++ b/symbols/literals.yml
@@ -82,7 +82,12 @@ overlay10:
     JP: 0x1F6A0
   description: Hard-coded immediate values (literals) in instructions within overlay 10.
   functions: []
-  data: []
+  data:
+    - name: DEFEAT_ITEM_LOSS_CHANCE
+      address:
+        EU: 0x22C3560
+        NA: 0x22C2C08
+      description: Chance of losing each individual bag item after being defeated in a dungeon (50%).
 overlay11:
   versions:
     - EU