diff --git a/genai-perf/README.md b/genai-perf/README.md
index 6e7d6f21..0f2609aa 100644
--- a/genai-perf/README.md
+++ b/genai-perf/README.md
@@ -346,7 +346,7 @@ key authentication. To do so, you must add your API key directly in the command.
 Add the following flag to your command.
 
 ```bash
--h "Authorization: Bearer ${API_KEY}" -H "Accept: text/event-stream"
+-H "Authorization: Bearer ${API_KEY}" -H "Accept: text/event-stream"
 ```
 
 </br>
@@ -467,7 +467,7 @@ Alternatively, a string representing a json formatted dict can be provided.
 (default: `None`)
 
 ##### `--header <str>`
-##### `--h <str>`
+##### `--H <str>`
 Add a custom header to the requests. Headers must be specified as
 'Header:Value'. You can repeat this flag for multiple headers.
 (default: `None`)
diff --git a/genai-perf/genai_perf/parser.py b/genai-perf/genai_perf/parser.py
index 35ad00fb..d147eee1 100644
--- a/genai-perf/genai_perf/parser.py
+++ b/genai-perf/genai_perf/parser.py
@@ -753,7 +753,7 @@ def _add_input_args(parser):
 
     input_group.add_argument(
         "--header",
-        "-h",
+        "-H",
         action="append",
         help="Add a custom header to the requests. "
         "Headers must be specified as 'Header:Value'. "
diff --git a/genai-perf/tests/test_cli.py b/genai-perf/tests/test_cli.py
index 12751f4f..8655435d 100644
--- a/genai-perf/tests/test_cli.py
+++ b/genai-perf/tests/test_cli.py
@@ -186,7 +186,7 @@ def test_help_version_arguments_output_and_exit(
                     ]
                 },
             ),
-            (["-h", "header_name:value"], {"header": ["header_name:value"]}),
+            (["-H", "header_name:value"], {"header": ["header_name:value"]}),
             (["--header", "header_name:value"], {"header": ["header_name:value"]}),
             (
                 ["--header", "header_name:value", "--header", "header_name_2:value_2"],