diff --git a/.pylintrc b/.pylintrc
index 05e46e69..73168af3 100644
--- a/.pylintrc
+++ b/.pylintrc
@@ -1,2 +1,2 @@
 [MESSAGES CONTROL]
-disable=C0103, R0913, R0902, R0903, R0914, C0209, C0123
+disable=C0103, R0913, R0902, R0903, R0914, C0209, C0123, R0917
diff --git a/PyPDFForm/widgets/base.py b/PyPDFForm/widgets/base.py
index 01b358cf..8723704a 100644
--- a/PyPDFForm/widgets/base.py
+++ b/PyPDFForm/widgets/base.py
@@ -52,6 +52,7 @@ def __init__(
                         value[0],
                         value[1],
                         value[2],
+                        value[3] if len(value) == 4 else 1,
                     )
                 self.acro_form_params[param] = value
             elif user_input in self.NONE_DEFAULTS:
diff --git a/docs/prepare.md b/docs/prepare.md
index 6df5b94f..ac7f1296 100644
--- a/docs/prepare.md
+++ b/docs/prepare.md
@@ -38,7 +38,7 @@ new_form = PdfWrapper("dummy.pdf").create_widget(
     font="Courier", # optional
     font_size=15,   # optional
     font_color=(1, 0, 0),   # optional
-    bg_color=(0, 0, 1), # optional
+    bg_color=(0, 0, 1, 1), # optional, (r, g, b, alpha)
     border_color=(1, 0, 0), # optional
     border_width=5,  # optional
     alignment=0, # optional, 0=left, 1=center, 2=right
@@ -65,7 +65,7 @@ new_form = PdfWrapper("dummy.pdf").create_widget(
     size=30,    # optional
     button_style="check",   # optional
     tick_color=(0, 1, 0),   # optional
-    bg_color=(0, 0, 1), # optional
+    bg_color=(0, 0, 1, 1), # optional, (r, g, b, alpha)
     border_color=(1, 0, 0), # optional
     border_width=5  # optional
 )
@@ -100,7 +100,7 @@ new_form = PdfWrapper("dummy.pdf").create_widget(
     font="Courier", # optional
     font_size=15,   # optional
     font_color=(1, 0, 0),   # optional
-    bg_color=(0, 0, 1), # optional
+    bg_color=(0, 0, 1, 1), # optional, (r, g, b, alpha)
     border_color=(1, 0, 0), # optional
     border_width=5  # optional
 )
diff --git a/pdf_samples/widget/create_text_alpha_bg_color.pdf b/pdf_samples/widget/create_text_alpha_bg_color.pdf
new file mode 100644
index 00000000..f2a09530
Binary files /dev/null and b/pdf_samples/widget/create_text_alpha_bg_color.pdf differ
diff --git a/tests/test_create_widget.py b/tests/test_create_widget.py
index d73dc9c2..ffaef475 100644
--- a/tests/test_create_widget.py
+++ b/tests/test_create_widget.py
@@ -198,6 +198,28 @@ def test_create_text_default(template_stream, pdf_samples, request):
         assert obj.stream == expected
 
 
+def test_create_text_alpha_bg_color(template_stream, pdf_samples, request):
+    expected_path = os.path.join(pdf_samples, "widget", "create_text_alpha_bg_color.pdf")
+    with open(expected_path, "rb+") as f:
+        obj = PdfWrapper(template_stream).create_widget(
+            "text",
+            "foo",
+            1,
+            100,
+            100,
+            bg_color=(0, 0, 1, 0),
+        )
+        assert obj.schema["properties"]["foo"]["type"] == "string"
+
+        request.config.results["expected_path"] = expected_path
+        request.config.results["stream"] = obj.read()
+
+        expected = f.read()
+
+        assert len(obj.stream) == len(expected)
+        assert obj.stream == expected
+
+
 def test_create_text_align_center(template_stream, pdf_samples, request):
     expected_path = os.path.join(pdf_samples, "widget", "create_text_align_center.pdf")
     with open(expected_path, "rb+") as f: