diff --git a/docs/vocabulary/derived-new-kanji.md b/docs/vocabulary/derived-new-kanji.md
new file mode 100644
index 0000000..1653d8b
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@@ -0,0 +1,7 @@
+# Special kanji words derived from other words
+
+## <ruby>碑<rt>いしぶみ</rt></ruby>
+
+Stone monument (石文)
+
+- 碑の<ruby>銘文<rt>めいぶん</rt></ruby>
diff --git a/forum/OP.md b/forum/OP.md
index 5d5894b..ff596f7 100644
--- a/forum/OP.md
+++ b/forum/OP.md
@@ -824,6 +824,6 @@ Putting on a better **roof** makes it **certain** to be **safe** (in an earthqua
 ![have-scooter|83x105, 50%](upload://u51eXd5SELCv2nkqc5T5MioPgE6.png) (I have a scooter (Have scooter))
 
 髄 - marrow, 55, ずい (bone+have-scooter)
-随 - all, 53, ずい (building+radihave-scootercal)
+随 - all, 53, ずい (building+have-scooter)
 
 [/details]
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