diff --git a/history.md b/history.md
index de52c96..9bd595d 100644
--- a/history.md
+++ b/history.md
@@ -1,3 +1,7 @@
+# 1.9.8
+
+- Log to output when document content exceed limit of semantic tokens.
+
 # 1.9.7
 
 - Change default of `javascript.autoClosingTags` and `typescript.autoClosingTags` to `true`.
diff --git a/src/server/features/semanticTokens.ts b/src/server/features/semanticTokens.ts
index 683f64f..2ad3e49 100644
--- a/src/server/features/semanticTokens.ts
+++ b/src/server/features/semanticTokens.ts
@@ -29,9 +29,14 @@ export default class TypeScriptDocumentSemanticTokensProvider implements Documen
     }
   }
 
+  private logIgnored(uri: string): void {
+    this.client.logger.warn(`${uri} content length exceed limit 100000`)
+  }
+
   async provideDocumentSemanticTokens(document: TextDocument, token: CancellationToken): Promise<SemanticTokens | null> {
     const file = this.client.toOpenedFilePath(document.uri)
     if (!file || document.getText().length > CONTENT_LENGTH_LIMIT) {
+      this.logIgnored(document.uri)
       return null
     }
     return this._provideSemanticTokens(document, { file, start: 0, length: document.getText().length }, token)
@@ -40,6 +45,7 @@ export default class TypeScriptDocumentSemanticTokensProvider implements Documen
   async provideDocumentRangeSemanticTokens(document: TextDocument, range: Range, token: CancellationToken): Promise<SemanticTokens | null> {
     const file = this.client.toOpenedFilePath(document.uri)
     if (!file || (document.offsetAt(range.end) - document.offsetAt(range.start) > CONTENT_LENGTH_LIMIT)) {
+      this.logIgnored(document.uri)
       return null
     }