diff --git a/lib/membrane_raw_video.ex b/lib/membrane_raw_video.ex
index a7fb768..b92b5f7 100644
--- a/lib/membrane_raw_video.ex
+++ b/lib/membrane_raw_video.ex
@@ -51,7 +51,7 @@ defmodule Membrane.RawVideo do
   in bytes for the given caps.
   """
   @spec frame_size(t()) :: {:ok, pos_integer()} | {:error, reason}
-        when reason: :invalid_dims | :invalid_pixel_format
+        when reason: :invalid_dimensions | :invalid_pixel_format
   def frame_size(%__MODULE__{pixel_format: format, width: width, height: height}) do
     frame_size(format, width, height)
   end
@@ -64,7 +64,7 @@ defmodule Membrane.RawVideo do
   """
   @spec frame_size(pixel_format_t(), width_t(), height_t()) ::
           {:ok, pos_integer()} | {:error, reason}
-        when reason: :invalid_dims | :invalid_pixel_format
+        when reason: :invalid_dimensions | :invalid_pixel_format
   def frame_size(format, width, height)
       when format in [:I420, :YV12, :NV12, :NV21] and Integer.is_even(width) and
              Integer.is_even(height) do
@@ -92,7 +92,7 @@ defmodule Membrane.RawVideo do
   end
 
   def frame_size(format, _width, _height) when format in @supported_pixel_formats do
-    {:error, :invalid_dims}
+    {:error, :invalid_dimensions}
   end
 
   def frame_size(_format, _width, _height) do
diff --git a/test/membrane_raw_video_test.exs b/test/membrane_raw_video_test.exs
index 1def7f0..9043bb6 100644
--- a/test/membrane_raw_video_test.exs
+++ b/test/membrane_raw_video_test.exs
@@ -15,22 +15,22 @@ defmodule Membrane.RawVideo.Test do
   test "frame_size for :I420 format" do
     format = :I420
     assert @module.frame_size(format, 10, 20) == {:ok, 300}
-    assert @module.frame_size(format, 9, 20) == {:error, :invalid_dims}
-    assert @module.frame_size(format, 10, 19) == {:error, :invalid_dims}
+    assert @module.frame_size(format, 9, 20) == {:error, :invalid_dimensions}
+    assert @module.frame_size(format, 10, 19) == {:error, :invalid_dimensions}
 
     assert @module.frame_size(format_struct(format, 10, 20)) == {:ok, 300}
-    assert @module.frame_size(format_struct(format, 9, 20)) == {:error, :invalid_dims}
-    assert @module.frame_size(format_struct(format, 10, 19)) == {:error, :invalid_dims}
+    assert @module.frame_size(format_struct(format, 9, 20)) == {:error, :invalid_dimensions}
+    assert @module.frame_size(format_struct(format, 10, 19)) == {:error, :invalid_dimensions}
   end
 
   test "frame_size for :I422 format" do
     format = :I422
     assert @module.frame_size(format, 10, 20) == {:ok, 400}
-    assert @module.frame_size(format, 9, 20) == {:error, :invalid_dims}
+    assert @module.frame_size(format, 9, 20) == {:error, :invalid_dimensions}
     assert @module.frame_size(format, 10, 19) == {:ok, 380}
 
     assert @module.frame_size(format_struct(format, 10, 20)) == {:ok, 400}
-    assert @module.frame_size(format_struct(format, 9, 20)) == {:error, :invalid_dims}
+    assert @module.frame_size(format_struct(format, 9, 20)) == {:error, :invalid_dimensions}
     assert @module.frame_size(format_struct(format, 10, 19)) == {:ok, 380}
   end
 
@@ -81,34 +81,34 @@ defmodule Membrane.RawVideo.Test do
   test "frame_size for :NV12 format" do
     format = :NV12
     assert @module.frame_size(format, 10, 20) == {:ok, 300}
-    assert @module.frame_size(format, 9, 20) == {:error, :invalid_dims}
-    assert @module.frame_size(format, 10, 19) == {:error, :invalid_dims}
+    assert @module.frame_size(format, 9, 20) == {:error, :invalid_dimensions}
+    assert @module.frame_size(format, 10, 19) == {:error, :invalid_dimensions}
 
     assert @module.frame_size(format_struct(format, 10, 20)) == {:ok, 300}
-    assert @module.frame_size(format_struct(format, 9, 20)) == {:error, :invalid_dims}
-    assert @module.frame_size(format_struct(format, 10, 19)) == {:error, :invalid_dims}
+    assert @module.frame_size(format_struct(format, 9, 20)) == {:error, :invalid_dimensions}
+    assert @module.frame_size(format_struct(format, 10, 19)) == {:error, :invalid_dimensions}
   end
 
   test "frame_size for :NV21 format" do
     format = :NV21
     assert @module.frame_size(format, 10, 20) == {:ok, 300}
-    assert @module.frame_size(format, 9, 20) == {:error, :invalid_dims}
-    assert @module.frame_size(format, 10, 19) == {:error, :invalid_dims}
+    assert @module.frame_size(format, 9, 20) == {:error, :invalid_dimensions}
+    assert @module.frame_size(format, 10, 19) == {:error, :invalid_dimensions}
 
     assert @module.frame_size(format_struct(format, 10, 20)) == {:ok, 300}
-    assert @module.frame_size(format_struct(format, 9, 20)) == {:error, :invalid_dims}
-    assert @module.frame_size(format_struct(format, 10, 19)) == {:error, :invalid_dims}
+    assert @module.frame_size(format_struct(format, 9, 20)) == {:error, :invalid_dimensions}
+    assert @module.frame_size(format_struct(format, 10, 19)) == {:error, :invalid_dimensions}
   end
 
   test "frame_size for :YV12 format" do
     format = :YV12
     assert @module.frame_size(format, 10, 20) == {:ok, 300}
-    assert @module.frame_size(format, 9, 20) == {:error, :invalid_dims}
-    assert @module.frame_size(format, 10, 19) == {:error, :invalid_dims}
+    assert @module.frame_size(format, 9, 20) == {:error, :invalid_dimensions}
+    assert @module.frame_size(format, 10, 19) == {:error, :invalid_dimensions}
 
     assert @module.frame_size(format_struct(format, 10, 20)) == {:ok, 300}
-    assert @module.frame_size(format_struct(format, 9, 20)) == {:error, :invalid_dims}
-    assert @module.frame_size(format_struct(format, 10, 19)) == {:error, :invalid_dims}
+    assert @module.frame_size(format_struct(format, 9, 20)) == {:error, :invalid_dimensions}
+    assert @module.frame_size(format_struct(format, 10, 19)) == {:error, :invalid_dimensions}
   end
 
   test "frame_size for :AYUV format" do