diff --git a/src/types/yomitan/termbank.ts b/src/types/yomitan/termbank.ts
index 5379b33..04c5f04 100644
--- a/src/types/yomitan/termbank.ts
+++ b/src/types/yomitan/termbank.ts
@@ -22,7 +22,11 @@ type DetailedDefinition =
       background?: boolean;
       collapsed?: boolean;
       collapsible?: boolean;
-    };
+    }
+  | [
+      uninflectedTerm: string, // The uninflected term.
+      inflectionRules: string[], // A chain of inflection rules that produced the inflected term
+    ];
 
 type StructuredContentData = {
   [key: string]: string;