diff --git a/packages/tendermint-rpc/src/client.ts b/packages/tendermint-rpc/src/client.ts
index 9bda89ea..b5845a75 100644
--- a/packages/tendermint-rpc/src/client.ts
+++ b/packages/tendermint-rpc/src/client.ts
@@ -75,7 +75,10 @@ export class Client {
   }
 
   /**
-   * Get block headers for minHeight <= height <= maxHeight.
+   * Queries block headers filtered by minHeight <= height <= maxHeight.
+   *
+   * @param minHeight The minimum height to be included in the result. Defaults to 0.
+   * @param maxHeight The maximum height to be included in the result. Defaults to infinity.
    */
   public async blockchain(minHeight?: number, maxHeight?: number): Promise<responses.BlockchainResponse> {
     const query: requests.BlockchainRequest = {
diff --git a/packages/tendermint-rpc/types/client.d.ts b/packages/tendermint-rpc/types/client.d.ts
index 5844ad64..92606f94 100644
--- a/packages/tendermint-rpc/types/client.d.ts
+++ b/packages/tendermint-rpc/types/client.d.ts
@@ -16,7 +16,10 @@ export declare class Client {
   block(height?: number): Promise<responses.BlockResponse>;
   blockResults(height?: number): Promise<responses.BlockResultsResponse>;
   /**
-   * Get block headers for minHeight <= height <= maxHeight.
+   * Queries block headers filtered by minHeight <= height <= maxHeight.
+   *
+   * @param minHeight The minimum height to be included in the result. Defaults to 0.
+   * @param maxHeight The maximum height to be included in the result. Defaults to infinity.
    */
   blockchain(minHeight?: number, maxHeight?: number): Promise<responses.BlockchainResponse>;
   /**