diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 4752a7c88..f5c36a5d3 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -41,6 +41,8 @@ repos:
     rev: v3.1.0
     hooks:
       - id: prettier
+        # HTML pre section bug https://github.com/prettier/prettier/issues/17042
+        exclude: "doc/factory/troubleshooting.html"
         exclude_types:
           - "python"
         additional_dependencies:
diff --git a/.prettierignore b/.prettierignore
index e300661ee..228e53ccf 100644
--- a/.prettierignore
+++ b/.prettierignore
@@ -3,3 +3,4 @@
 
 build/ReleaseManager/tags_example.yaml
 creation/web_base/factoryEntryStatusNow.html
+doc/factory/troubleshooting.html
diff --git a/doc/factory/troubleshooting.html b/doc/factory/troubleshooting.html
index a988a02ea..13861f7b2 100644
--- a/doc/factory/troubleshooting.html
+++ b/doc/factory/troubleshooting.html
@@ -792,6 +792,8 @@ <h2>
         </h2>
         The gfdiff tool has been improved to use positional arguments instead of options. You can use it to check differences among entries in the XML configuration. For example:
         <blockquote>
+<!-- prettier-ignore -->
+<!-- prettier-ignore-start -->
           <pre>
             [0618] gfactory@gfactory-2 ~/mmascher/gfdiff$ ./gfdiff 10-hosted-ces.auto.xml.new 10-hosted-ces.auto.xml.bak241121 OSG_US_CHTC-Spark-CE1-gpu
             --- text_a
@@ -825,9 +827,10 @@ <h2>
                      <files>
                      </files>
           </pre>
+<!-- prettier-ignore-end -->
         </blockquote>
       </div>
-      
+
       <div class="footer">
         Banner image by
         <a href="http://www.flickr.com/people/leafwarbler/">Madhusudan Katti</a>
diff --git a/factory/tools/gfdiff.py b/factory/tools/gfdiff.py
index c92a16eae..db0523b46 100644
--- a/factory/tools/gfdiff.py
+++ b/factory/tools/gfdiff.py
@@ -21,43 +21,28 @@ def parse_opts():
     """Parse the command line options for this command"""
     description = "Do a diff of two entries\n\n"
 
-    parser = argparse.ArgumentParser(description=description,
-                                     formatter_class=argparse.RawTextHelpFormatter)
+    parser = argparse.ArgumentParser(description=description, formatter_class=argparse.RawTextHelpFormatter)
 
     # Positional arguments
     parser.add_argument(
-        "conf_a",
-        type=str,
-        help="Configuration for the first entry",
-        default="/etc/gwms-factory/glideinWMS.xml"
+        "conf_a", type=str, help="Configuration for the first entry.", default="/etc/gwms-factory/glideinWMS.xml"
     )
 
     parser.add_argument(
-        "conf_b",
-        type=str,
-        help="Configuration for the second entry",
-        default="/etc/gwms-factory/glideinWMS.xml"
+        "conf_b", type=str, help="Configuration for the second entry.", default="/etc/gwms-factory/glideinWMS.xml"
     )
 
-    parser.add_argument(
-        "entry_a",
-        type=str,
-        help="Name of the first entry"
-    )
+    parser.add_argument("entry_a", type=str, help="Name of the first entry.")
 
     parser.add_argument(
         "entry_b",
         type=str,
         nargs="?",  # Makes this positional argument optional
-        help="Name of the second entry (optional)"
+        help="Name of the second entry (optional). Defaults to the first entry name.",
     )
 
     # Named argument
-    parser.add_argument(
-        "--mergely",
-        action="count",
-        help="Only print the mergely link"
-    )
+    parser.add_argument("--mergely", action="count", help="Only print the mergely link")
 
     options = parser.parse_args()
 
@@ -83,11 +68,7 @@ def handle_diff(text_a, text_b):
     lines_b = text_b.splitlines()
 
     # Create a unified diff
-    diff = difflib.unified_diff(
-        lines_a, lines_b,
-        fromfile="text_a", tofile="text_b",
-        lineterm=""
-    )
+    diff = difflib.unified_diff(lines_a, lines_b, fromfile="text_a", tofile="text_b", lineterm="")
 
     # Print the diff line by line
     for line in diff:
@@ -99,24 +80,20 @@ def handle_mergely(text_a, text_b):
 
     url = "https://mergely.com/ajax/handle_save.php"
 
-    payload = {
-        "config": {},
-        "lhs_title": "",
-        "lhs": text_a,
-        "rhs_title": "",
-        "rhs": text_b
+    payload = {"config": {}, "lhs_title": "", "lhs": text_a, "rhs_title": "", "rhs": text_b}
+
+    # HTTP header field names are case-insensitive but MUST be converted to lowercase by the API
+    headers = {
+        "Accept": "*/*",
+        "Accept-Language": "en-US,en;q=0.5",
+        "Accept-Encoding": "gzip, deflate, br, zstd",
+        "Referer": "https://editor.mergely.com/",
+        "Content-Type": "application/json; charset=utf-8",
+        "Content-Length": str(len(str(payload))),
+        "Origin": "https://editor.mergely.com",
+        "Connection": "keep-alive",
     }
 
-    headers = {}
-    headers["Accept"] = "*/*"
-    headers["Accept-Language"] = "en-US,en;q=0.5"
-    headers["Accept-Encoding"] = "gzip, deflate, br, zstd"
-    headers["Referer"] = "https://editor.mergely.com/"
-    headers["content-type"] = "application/json; charset=utf-8"
-    headers["Content-Length"] = str(len(str(payload)))
-    headers["Origin"] = "https://editor.mergely.com"
-    headers["Connection"] = "keep-alive"
-
     res = requests.post(url, headers=headers, json=payload)
 
     print("http://www.mergely.com/" + res.headers["location"])
@@ -143,7 +120,6 @@ def main():
         print(f"Cannot find entry {options.entry_b} in the configuration file {options.conf_b}")
         sys.exit(1)
 
-
     text_a = get_entry_text(options.entry_a, options.conf_a)
     text_b = get_entry_text(options.entry_b, options.conf_b)
     handle_diff(text_a, text_b)