diff --git a/scripts/prompt_matrix.py b/scripts/prompt_matrix.py
index dd95e588..de921ea8 100644
--- a/scripts/prompt_matrix.py
+++ b/scripts/prompt_matrix.py
@@ -44,16 +44,40 @@ class Script(scripts.Script):
     def title(self):
         return "Prompt matrix"
 
-    def ui(self, is_img2img):        
-        put_at_start = gr.Checkbox(label='Put variable parts at start of prompt', value=False, elem_id=self.elem_id("put_at_start"))
-        different_seeds = gr.Checkbox(label='Use different seed for each picture', value=False, elem_id=self.elem_id("different_seeds"))
+    def ui(self, is_img2img):
+        gr.HTML('<br />')
+        with gr.Row():
+            with gr.Column():
+                put_at_start = gr.Checkbox(label='Put variable parts at start of prompt',
+                                           value=False, elem_id=self.elem_id("put_at_start"))
+            with gr.Column():
+                # Radio buttons for selecting the prompt between positive and negative
+                prompt_type = gr.Radio(["positive", "negative"], label="Select prompt",
+                                       elem_id=self.elem_id("prompt_type"), value="positive")
+        with gr.Row():
+            with gr.Column():
+                different_seeds = gr.Checkbox(
+                    label='Use different seed for each picture', value=False, elem_id=self.elem_id("different_seeds"))
+            with gr.Column():
+                # Radio buttons for selecting the delimiter to use in the resulting prompt
+                variations_delimiter = gr.Radio(["comma", "space"], label="Select delimiter", elem_id=self.elem_id(
+                    "variations_delimiter"), value="comma")
+        return [put_at_start, different_seeds, prompt_type, variations_delimiter]
 
-        return [put_at_start, different_seeds]
-
-    def run(self, p, put_at_start, different_seeds):
+    def run(self, p, put_at_start, different_seeds, prompt_type, variations_delimiter):
         modules.processing.fix_seed(p)
+        # Raise error if promp type is not positive or negative
+        if prompt_type not in ["positive", "negative"]:
+            raise ValueError(f"Unknown prompt type {prompt_type}")
+        # Raise error if variations delimiter is not comma or space
+        if variations_delimiter not in ["comma", "space"]:
+            raise ValueError(f"Unknown variations delimiter {variations_delimiter}")
 
-        original_prompt = p.prompt[0] if type(p.prompt) == list else p.prompt
+        prompt = p.prompt if prompt_type == "positive" else p.negative_prompt
+        original_prompt = prompt[0] if type(prompt) == list else prompt
+        positive_prompt = p.prompt[0] if type(p.prompt) == list else p.prompt
+
+        delimiter = ", " if variations_delimiter == "comma" else " "
 
         all_prompts = []
         prompt_matrix_parts = original_prompt.split("|")
@@ -66,16 +90,19 @@ class Script(scripts.Script):
             else:
                 selected_prompts = [prompt_matrix_parts[0]] + selected_prompts
 
-            all_prompts.append(", ".join(selected_prompts))
+            all_prompts.append(delimiter.join(selected_prompts))
 
         p.n_iter = math.ceil(len(all_prompts) / p.batch_size)
         p.do_not_save_grid = True
 
         print(f"Prompt matrix will create {len(all_prompts)} images using a total of {p.n_iter} batches.")
 
-        p.prompt = all_prompts
+        if prompt_type == "positive":
+            p.prompt = all_prompts
+        else:
+            p.negative_prompt = all_prompts
         p.seed = [p.seed + (i if different_seeds else 0) for i in range(len(all_prompts))]
-        p.prompt_for_display = original_prompt
+        p.prompt_for_display = positive_prompt
         processed = process_images(p)
 
         grid = images.image_grid(processed.images, p.batch_size, rows=1 << ((len(prompt_matrix_parts) - 1) // 2))