diff --git a/libs/geo-api-client/src/GeoApiClient.ts b/libs/geo-api-client/src/GeoApiClient.ts
index 8855ae9..4bf024c 100644
--- a/libs/geo-api-client/src/GeoApiClient.ts
+++ b/libs/geo-api-client/src/GeoApiClient.ts
@@ -5,18 +5,31 @@ import type { InvitationPayload, StorageLike, StoredKeys } from "./types";
 
 type RequestInitLike = Omit<RequestInit, "body"> & { body?: unknown };
 
+/**
+ * TypeScript API client for Momswap Geo backend.
+ * Handles Ed25519 key storage, auth flows, and GeoJSON collection/feature CRUD.
+ */
 export class GeoApiClient {
   private readonly baseUrl: string;
   private readonly storage: StorageLike;
   private readonly storageKey: string;
   private accessToken: string | null = null;
 
+  /**
+   * @param baseUrl - API base URL (e.g. https://momswap.produktor.duckdns.org)
+   * @param storage - Storage adapter (localStorage-like: getItem, setItem, removeItem)
+   * @param storageKey - Key for persisting keypair (default from DEFAULT_KEYS_STORAGE_KEY)
+   */
   constructor(baseUrl: string, storage: StorageLike, storageKey = DEFAULT_KEYS_STORAGE_KEY) {
     this.baseUrl = baseUrl.replace(/\/+$/g, "");
     this.storage = storage;
     this.storageKey = storageKey;
   }
 
+  /**
+   * Ensure a keypair exists in storage. If none found, generates a new Ed25519 keypair and saves it.
+   * Use on app init so the user always has keys ready for auth.
+   */
   async ensureKeysInStorage(): Promise<StoredKeys> {
     const existing = loadKeys(this.storage, this.storageKey);
     if (existing) {
@@ -27,22 +40,30 @@ export class GeoApiClient {
     return generated;
   }
 
+  /** Get the stored keypair without generating. Returns null if none stored. */
   getStoredKeys(): StoredKeys | null {
     return loadKeys(this.storage, this.storageKey);
   }
 
+  /**
+   * Derive public key from private key (Ed25519).
+   * Use when importing a private key from backup/QR to restore the public key.
+   */
   async derivePublicKey(privateKey: string): Promise<string> {
     return getPublicKeyFromPrivate(privateKey);
   }
 
+  /** Overwrite stored keypair (e.g. after import from backup or restore from QR). */
   importKeys(keys: StoredKeys): void {
     saveKeys(this.storage, keys, this.storageKey);
   }
 
+  /** Read stored keypair for export/backup. Does not modify storage. */
   exportKeys(): StoredKeys | null {
     return loadKeys(this.storage, this.storageKey);
   }
 
+  /** Set bearer token for authenticated requests. Call after loginWithSignature. */
   setAccessToken(token: string | null): void {
     this.accessToken = token;
   }
@@ -67,14 +88,26 @@ export class GeoApiClient {
     return (await res.json()) as T;
   }
 
+  /**
+   * Fetch the API service public key. Used for registerBySigningServiceKey
+   * and for clients that need to verify server responses.
+   */
   async getServicePublicKey(): Promise<{ publicKey: string }> {
     return this.request("/v1/service-key", { method: "GET" });
   }
 
+  /**
+   * Request a login challenge. Returns nonce and messageToSign.
+   * Used internally by loginWithSignature; or for custom login flows.
+   */
   async createChallenge(publicKey: string): Promise<{ nonce: string; messageToSign: string }> {
     return this.request("/v1/auth/challenge", { method: "POST", body: { publicKey } });
   }
 
+  /**
+   * Register without invitation by signing the API service public key.
+   * Use when SERVICE_PUBLIC_KEY/ADMIN_PUBLIC_KEY is set. Throws 409 if already registered.
+   */
   async registerBySigningServiceKey(publicKey: string, privateKey: string): Promise<void> {
     const { publicKey: servicePublicKey } = await this.getServicePublicKey();
     const signature = await signMessage(privateKey, servicePublicKey);
@@ -84,6 +117,11 @@ export class GeoApiClient {
     });
   }
 
+  /**
+   * Login via challenge-response. Signs the login nonce, returns bearer token.
+   * Stores token internally; call setAccessToken if you need it elsewhere.
+   * Requires user to be registered first (registerBySigningServiceKey or registerWithInvitation).
+   */
   async loginWithSignature(publicKey: string, privateKey: string): Promise<string> {
     const challenge = await this.createChallenge(publicKey);
     const signature = await signMessage(privateKey, challenge.messageToSign);
@@ -99,6 +137,10 @@ export class GeoApiClient {
     return response.accessToken;
   }
 
+  /**
+   * Create an invitation for new users. Authenticated inviter signs the payload.
+   * Use when invitation-based onboarding is required (no register-by-signature).
+   */
   async createInvitation(payload: InvitationPayload, inviterPrivateKey: string): Promise<void> {
     const payloadStr = JSON.stringify(payload);
     const payloadB64 = bytesToBase64Url(textToBytes(payloadStr));
@@ -112,6 +154,10 @@ export class GeoApiClient {
     });
   }
 
+  /**
+   * Register using an invitation. Proves ownership of keys and redeems the invite.
+   * Use when user has received an invitation (e.g. from createInvitation).
+   */
   async registerWithInvitation(input: {
     publicKey: string;
     privateKey: string;
@@ -131,14 +177,17 @@ export class GeoApiClient {
     });
   }
 
+  /** List collections for the authenticated user. Requires login first. */
   async listCollections(): Promise<{ collections: Array<{ id: string; name: string }> }> {
     return this.request("/v1/collections", { method: "GET" });
   }
 
+  /** Create a new collection. Returns id and name. */
   async createCollection(name: string): Promise<{ id: string; name: string }> {
     return this.request("/v1/collections", { method: "POST", body: { name } });
   }
 
+  /** Rename a collection. Must own it. */
   async updateCollection(collectionId: string, name: string): Promise<{ id: string; name: string }> {
     return this.request(`/v1/collections/${collectionId}`, {
       method: "PATCH",
@@ -146,14 +195,20 @@ export class GeoApiClient {
     });
   }
 
+  /** Delete a collection and its features. Must own it. */
   async deleteCollection(collectionId: string): Promise<void> {
     return this.request(`/v1/collections/${collectionId}`, { method: "DELETE" });
   }
 
+  /** List GeoJSON features in a collection. Must own the collection. */
   async listFeatures(collectionId: string): Promise<{ features: unknown[] }> {
     return this.request(`/v1/collections/${collectionId}/features`, { method: "GET" });
   }
 
+  /**
+   * Add a Point feature to a collection. lon ∈ [-180,180], lat ∈ [-90,90].
+   * properties can include name, etc. Returns the new feature id.
+   */
   async createPointFeature(
     collectionId: string,
     lon: number,
@@ -169,6 +224,7 @@ export class GeoApiClient {
     });
   }
 
+  /** Delete a feature. Must own it. */
   async deleteFeature(featureId: string): Promise<void> {
     return this.request(`/v1/features/${featureId}`, { method: "DELETE" });
   }