diff --git a/src/alpaca/exchange.ts b/src/alpaca/exchange.ts
index 2edca77..725161e 100644
--- a/src/alpaca/exchange.ts
+++ b/src/alpaca/exchange.ts
@@ -5,7 +5,13 @@ import { Exchange } from '../interface/exchange'
 import { PortfolioProvider } from '../interface/portfolio'
 import { QuoteProvider } from '../interface/quote'
 
+/**
+ * Exchange implementation for Alpaca.
+ */
 export class AlpacaExchange implements Exchange {
+    /**
+     * The Alpaca API client.
+     */
     readonly alpaca: Alpaca;
 
     /**
@@ -23,6 +29,13 @@ export class AlpacaExchange implements Exchange {
      */
     readonly name: string;
 
+    /**
+     * Creates an instance of the Alpaca exchange.
+     * @constructor
+     * @param {string} keyId - The API key ID for the Alpaca exchange.
+     * @param {string} secretKey - The secret key for the Alpaca exchange.
+     * @param {boolean} paper - Whether to use the paper trading environment or not.
+     */
     constructor(keyId: string, secretKey: string, paper: boolean) {
         this.alpaca = new Alpaca({
             keyId: keyId,
diff --git a/src/alpaca/portfolio.ts b/src/alpaca/portfolio.ts
index f21102a..9472e56 100644
--- a/src/alpaca/portfolio.ts
+++ b/src/alpaca/portfolio.ts
@@ -1,6 +1,10 @@
 import Alpaca from '@alpacahq/alpaca-trade-api'
 import { PortfolioProvider, Portfolio, Position } from '../interface/portfolio';
 
+/**
+ * The position object returned by Alpaca.
+ * @see https://alpaca.markets/docs/api-references/trading-api/positions/#properties
+ */
 class AlpacaPosition {
     asset_id!: string;
     symbol!: string;
@@ -22,9 +26,18 @@ class AlpacaPosition {
     asset_marginable!: string;
 }
 
+/**
+ * Provides a portfolio using the Alpaca API client.
+ */
 export class AlpacaPortfolioProvider implements PortfolioProvider {
+    /**
+     * The Alpaca API client.
+     */
     readonly alpaca: Alpaca;
 
+    /**
+     * Fetches the portfolio.
+     */
     readonly fetchPortfolio = (): Promise<Portfolio> => {
         return (this.alpaca.getPositions() as Promise<AlpacaPosition[]>).then((positions) => {
             return new Portfolio(positions.map((position) => {
@@ -39,6 +52,11 @@ export class AlpacaPortfolioProvider implements PortfolioProvider {
         });
     }
 
+    /**
+     * Creates a new AlpacaPortfolioProvider instance.
+     * @constructor
+     * @param {Alpaca} alpaca - The Alpaca API client.
+     */
     constructor(alpaca: Alpaca) {
         this.alpaca = alpaca;
     }
diff --git a/src/alpaca/quote.ts b/src/alpaca/quote.ts
index df8eab9..0b6e291 100644
--- a/src/alpaca/quote.ts
+++ b/src/alpaca/quote.ts
@@ -1,9 +1,20 @@
 import Alpaca from '@alpacahq/alpaca-trade-api'
 import { QuoteProvider, Quote } from '../interface/quote';
 
+/**
+ * Provides quotes using the Alpaca API.
+ */
 export class AlpacaQuoteProvider implements QuoteProvider {
+    /**
+     * The Alpaca API client.
+     */
     readonly alpaca: Alpaca;
 
+    /**
+     * Fetches a quote for the given stock symbol.
+     * @param symbol The stock symbol to fetch the quote for.
+     * @returns A Promise that resolves to a Quote object.
+     */
     readonly fetchQuote = (symbol: string): Promise<Quote> => {
         return this.alpaca.getLatestQuote(symbol).then((quote) => {
             return new Quote(
@@ -19,6 +30,11 @@ export class AlpacaQuoteProvider implements QuoteProvider {
         })
     }
 
+    /**
+     * Creates a new AlpacaQuoteProvider instance.
+     * @constructor
+     * @param {Alpaca} alpaca - The Alpaca API client.
+     */
     constructor(alpaca: Alpaca) {
         this.alpaca = alpaca;
     }