diff --git a/lib/imagekitio/constants/supported_transformation.rb b/lib/imagekitio/constants/supported_transformation.rb
index c8158b6..864cad9 100644
--- a/lib/imagekitio/constants/supported_transformation.rb
+++ b/lib/imagekitio/constants/supported_transformation.rb
@@ -18,6 +18,33 @@ module SupportedTransformation
         'rotation': "rt",
         'blur': "bl",
         'named': "n",
+        'overlay_image': "oi",
+        'overlay_image_trim': "oit",
+        'overlay_image_cropping': "oic",
+        'overlay_image_quality': "oiq",
+        'overlay_image_DPR': "oidpr",
+        'overlay_image_border': "oib",
+        'overlay_image_background': "oibg",
+        'overlay_image_aspect_ratio': "oiar",
+        'overlay_x': "ox",
+        'overlay_y': "oy",
+        'overlay_focus': "ofo",
+        'overlay_height': "oh",
+        'overlay_width': "ow",
+        'overlay_text': "ot",
+        'overlay_text_font_size': "ots",
+        'overlay_text_font_family': "otf",
+        'overlay_text_encoded': "ote",
+        'overlay_text_color': "otc",
+        'overlay_text_width': "otw",
+        'overlay_text_background': "otbg",
+        'overlay_text_padding': "otp",
+        'overlay_text_inner_alignment': "otia",
+        'overlay_text_transparency': "oa",
+        'overlay_alpha': "oa",
+        'overlay_radius': "or",
+        'overlay_text_typography': "ott",
+        'overlay_background': "obg",
         'progressive': "pr",
         'lossless': "lo",
         'trim': "t",
diff --git a/test/imagekit/url_test.rb b/test/imagekit/url_test.rb
index 88b6051..e0163ba 100644
--- a/test/imagekit/url_test.rb
+++ b/test/imagekit/url_test.rb
@@ -158,6 +158,32 @@
                                      rotation: 90,
                                      blur: 10,
                                      named: "some_name",
+                                     overlay_x: 35,
+                                     overlay_y: 35,
+                                     overlay_focus: "bottom",
+                                     overlay_height: 20,
+                                     overlay_width: 20,
+                                     overlay_image: "/folder/file.jpg",
+                                     overlay_image_trim: false,
+                                     overlay_image_aspect_ratio: "4:3",
+                                     overlay_image_background: "0F0F0F",
+                                     overlay_image_border: "10_0F0F0F",
+                                     overlay_image_DPR: 2,
+                                     overlay_image_quality: 50,
+                                     overlay_image_cropping: "force",
+                                     overlay_text: "two words",
+                                     overlay_text_font_size: 20,
+                                     overlay_text_font_family: "Open Sans",
+                                     overlay_text_color: "00FFFF",
+                                     overlay_text_transparency: 5,
+                                     overlay_text_typography: "b",
+                                     overlay_background: "00AAFF55",
+                                     overlay_text_encoded: "b3ZlcmxheSBtYWRlIGVhc3k%3D",
+                                     overlay_text_width: 50,
+                                     overlay_text_background: "00AAFF55",
+                                     overlay_text_padding: 40,
+                                     overlay_text_inner_alignment: "left",
+                                     overlay_radius: 10,
                                      progressive: true,
                                      lossless: true,
                                      trim: 5,
@@ -176,7 +202,7 @@
                                    },]
       }
       url = url_obj.generate_url(options)
-      expect(url).to eq("https://imagekit.io/your-imgekit-id/tr:h-300,w-400,ar-4-3,q-40,c-force,cm-extract,fo-left,f-jpeg,r-50,bg-A94D34,b-5-A94D34,rt-90,bl-10,n-some_name,pr-true,lo-true,t-5,md-true,cp-true,di-folder@@file.jpg,dpr-3,e-sharpen-10,e-usm-2-2-0.8-0.024,e-contrast-true,e-grayscale-true,e-shadow-bl-15_st-40_x-10_y-N5,e-gradient-from-red_to-white,orig-true,w-200,h-200/default-image.jpg")
+      expect(url).to eq("https://imagekit.io/your-imgekit-id/tr:h-300,w-400,ar-4-3,q-40,c-force,cm-extract,fo-left,f-jpeg,r-50,bg-A94D34,b-5-A94D34,rt-90,bl-10,n-some_name,ox-35,oy-35,ofo-bottom,oh-20,ow-20,oi-folder@@file.jpg,oit-false,oiar-4:3,oibg-0F0F0F,oib-10_0F0F0F,oidpr-2,oiq-50,oic-force,ot-two words,ots-20,otf-Open Sans,otc-00FFFF,oa-5,ott-b,obg-00AAFF55,ote-b3ZlcmxheSBtYWRlIGVhc3k%3D,otw-50,otbg-00AAFF55,otp-40,otia-left,or-10,pr-true,lo-true,t-5,md-true,cp-true,di-folder@@file.jpg,dpr-3,e-sharpen-10,e-usm-2-2-0.8-0.024,e-contrast-true,e-grayscale-true,e-shadow-bl-15_st-40_x-10_y-N5,e-gradient-from-red_to-white,orig-true,w-200,h-200/default-image.jpg")
     end
 
     it "test_generate_url_with_chained_transformation" do