diff --git a/tools/idf.py b/tools/idf.py
index a09944fa09..430f1ce0ba 100755
--- a/tools/idf.py
+++ b/tools/idf.py
@@ -1152,7 +1152,7 @@ def init_cli():
 
     baud_rate = {
         "names": ["-b", "--baud"],
-        "help": "Baud rate for flashing.",
+        "help": "Baud rate for flashing. The default value can be set with the ESPBAUD environment variable.",
         "scope": "global",
         "envvar": "ESPBAUD",
         "default": 460800,
@@ -1160,7 +1160,7 @@ def init_cli():
 
     port = {
         "names": ["-p", "--port"],
-        "help": "Serial port.",
+        "help": "Serial port. The default value can be set with the ESPPORT environment variable.",
         "scope": "global",
         "envvar": "ESPPORT",
         "default": None,