diff --git a/packages/sdk38/src/wallet.spec.ts b/packages/sdk38/src/wallet.spec.ts
index c016b1a8..d9992ad2 100644
--- a/packages/sdk38/src/wallet.spec.ts
+++ b/packages/sdk38/src/wallet.spec.ts
@@ -10,9 +10,12 @@ describe("Secp256k1Wallet", () => {
   const defaultPubkey = fromHex("02baa4ef93f2ce84592a49b1d729c074eab640112522a7a89f7d03ebab21ded7b6");
   const defaultAddress = "cosmos1jhg0e7s6gn44tfc5k37kr04sznyhedtc9rzys5";
 
-  it("can be constructed", async () => {
-    const wallet = await Secp256k1Wallet.fromMnemonic(defaultMnemonic);
-    expect(wallet).toBeTruthy();
+  describe("fromMnemonic", () => {
+    it("works", async () => {
+      const wallet = await Secp256k1Wallet.fromMnemonic(defaultMnemonic);
+      expect(wallet).toBeTruthy();
+      expect(wallet.mnemonic).toEqual(defaultMnemonic);
+    });
   });
 
   describe("getAccounts", () => {
diff --git a/packages/sdk38/src/wallet.ts b/packages/sdk38/src/wallet.ts
index c252d9a7..1efb4075 100644
--- a/packages/sdk38/src/wallet.ts
+++ b/packages/sdk38/src/wallet.ts
@@ -65,27 +65,35 @@ export function makeCosmoshubPath(a: number): readonly Slip10RawIndex[] {
 
 export class Secp256k1Wallet implements OfflineSigner {
   public static async fromMnemonic(
-    mnemonic: string,
+    mnemonicInput: string,
     hdPath: readonly Slip10RawIndex[] = makeCosmoshubPath(0),
     prefix = "cosmos",
   ): Promise<Secp256k1Wallet> {
-    const seed = await Bip39.mnemonicToSeed(new EnglishMnemonic(mnemonic));
+    const mnemonic = new EnglishMnemonic(mnemonicInput);
+    const seed = await Bip39.mnemonicToSeed(mnemonic);
     const { privkey } = Slip10.derivePath(Slip10Curve.Secp256k1, seed, hdPath);
     const uncompressed = (await Secp256k1.makeKeypair(privkey)).pubkey;
-    return new Secp256k1Wallet(privkey, Secp256k1.compressPubkey(uncompressed), prefix);
+    return new Secp256k1Wallet(mnemonic, privkey, Secp256k1.compressPubkey(uncompressed), prefix);
   }
 
+
+  private readonly mnemonicData: EnglishMnemonic;
   private readonly pubkey: Uint8Array;
   private readonly privkey: Uint8Array;
   private readonly prefix: string;
   private readonly algo: Algo = "secp256k1";
 
-  private constructor(privkey: Uint8Array, pubkey: Uint8Array, prefix: string) {
+  private constructor(mnemonic: EnglishMnemonic, privkey: Uint8Array, pubkey: Uint8Array, prefix: string) {
+    this.mnemonicData = mnemonic;
     this.privkey = privkey;
     this.pubkey = pubkey;
     this.prefix = prefix;
   }
 
+  public get mnemonic(): string {
+    return this.mnemonicData.toString();
+  }
+
   private get address(): string {
     return rawSecp256k1PubkeyToAddress(this.pubkey, this.prefix);
   }
diff --git a/packages/sdk38/types/wallet.d.ts b/packages/sdk38/types/wallet.d.ts
index 463ce554..0c29481d 100644
--- a/packages/sdk38/types/wallet.d.ts
+++ b/packages/sdk38/types/wallet.d.ts
@@ -24,15 +24,17 @@ export interface OfflineSigner {
 export declare function makeCosmoshubPath(a: number): readonly Slip10RawIndex[];
 export declare class Secp256k1Wallet implements OfflineSigner {
   static fromMnemonic(
-    mnemonic: string,
+    mnemonicInput: string,
     hdPath?: readonly Slip10RawIndex[],
     prefix?: string,
   ): Promise<Secp256k1Wallet>;
+  private readonly mnemonicData;
   private readonly pubkey;
   private readonly privkey;
   private readonly prefix;
   private readonly algo;
   private constructor();
+  get mnemonic(): string;
   private get address();
   getAccounts(): Promise<readonly AccountData[]>;
   sign(address: string, message: Uint8Array, prehashType?: PrehashType): Promise<StdSignature>;