diff --git a/11_write_factorytest_by_esptool.sh b/11_write_factorytest_by_esptool.sh
index 0768775..ecaf751 100755
--- a/11_write_factorytest_by_esptool.sh
+++ b/11_write_factorytest_by_esptool.sh
@@ -7,7 +7,9 @@
 # BUILD_TOOLの文字列の長さが20以上の場合は、終了する
 if [ ${#BUILD_TOOL} -ge 20 ]; then
     echo "==="
+    echo "esptool module is installed"
     echo "Please execute the script again."
+    echo "もう一度実行してください。"
     echo "==="
     exit 1
 fi
diff --git a/lib.sh b/lib.sh
index 9b2d682..2d92e3b 100644
--- a/lib.sh
+++ b/lib.sh
@@ -18,9 +18,7 @@
             echo "$WIN_PYTHON -m esptool"
             return
         else
-            echo "installing esptool module for python first."
-            bash -c "$WIN_PYTHON -m pip install esptool"
-            echo "Please execute the script again."
+            bash -c "$WIN_PYTHON -m pip install esptool --no-warn-script-location"
             return
         fi
         echo "$WIN_PYTHON -m esptool"