diff --git a/README.md b/README.md
index ac85624..0f1b8cc 100644
--- a/README.md
+++ b/README.md
@@ -254,6 +254,7 @@ look at the examples provided in `./example`.
  - Value at Risk, 
  - Sharpe Ratio,
  - Sortino Ratio,
+ - Treynor Ratio,
  - Beta parameter,
  - R squared coefficient.
 
diff --git a/example/Example-Build-Portfolio-from-web.py b/example/Example-Build-Portfolio-from-web.py
index 066d913..d0abe52 100644
--- a/example/Example-Build-Portfolio-from-web.py
+++ b/example/Example-Build-Portfolio-from-web.py
@@ -67,7 +67,7 @@
 #
 # In the below example we are using `yfinance` to download stock data. We specify the start and end date of the stock prices to be downloaded.
 # We also provide the optional parameter `market_index` to download the historical data of a market index.
-# `FinQuant` can use them to calculate the beta parameter and R squared coefficient, measuring the portfolio's daily volatility and relationship compared to the market.
+# `FinQuant` can use them to calculate the Treynor Ratio, beta parameter, and R squared coefficient, measuring the portfolio's daily volatility compared to the market.
 
 # <codecell>
 
diff --git a/finquant/quants.py b/finquant/quants.py
index b027448..763b8ff 100644
--- a/finquant/quants.py
+++ b/finquant/quants.py
@@ -124,7 +124,7 @@ def sortino_ratio(
 
 def treynor_ratio(
     exp_return: FLOAT, beta: FLOAT_OPTIONAL, risk_free_rate: FLOAT = 0.005
-) -> FLOAT:
+) -> FLOAT_OPTIONAL:
     """Computes the Treynor Ratio.
 
     :param exp_return: Expected Return of a portfolio
@@ -138,7 +138,7 @@ def treynor_ratio(
 
     :rtype: :py:data:`~.finquant.data_types.FLOAT`
     :return: Treynor Ratio as a floating point number:
-        ``(exp_return - risk_free_rate) / float(beta)``
+        ``(exp_return - risk_free_rate) / beta``
     """
     # Type validations:
     type_validation(
@@ -147,7 +147,7 @@ def treynor_ratio(
         risk_free_rate=risk_free_rate,
     )
     if beta is None:
-        return np.nan
+        return None
     else:
         res_treynor_ratio: FLOAT = (exp_return - risk_free_rate) / beta
         return res_treynor_ratio
diff --git a/tests/test_market.py b/tests/test_market.py
index 5524796..cccb2c4 100644
--- a/tests/test_market.py
+++ b/tests/test_market.py
@@ -41,3 +41,4 @@ def test_Market():
     assert pf.market_index.name == "^GSPC"
     assert pf.beta is not None
     assert pf.rsquared is not None
+    assert pf.treynor is not None