diff --git a/03_sensing/BUILD.gn b/03_sensing/BUILD.gn
index 593e5129d71c341a38bbff348ffddfb3b9938251..6be8f9ead2c1eb25bcc762e6eb949bb099fb52f9 100644
--- a/03_sensing/BUILD.gn
+++ b/03_sensing/BUILD.gn
@@ -29,7 +29,7 @@ static_library("sensing_demo") {
     sources = [
         # "colorful_light_demo.c",
         # "oled_demo.c", "oled_ssd1306.c",
-        "envrionment_demo.c", "oled_ssd1306.c", "aht20.c"
+        "environment_demo.c", "oled_ssd1306.c", "aht20.c"
     ]
 
     include_dirs = [
diff --git a/03_sensing/README.md b/03_sensing/README.md
index e3767d2cb8369b6fc54652ae254670fcefb600ad..c57e9822fd2c3bb34e914db6eac8552779865f31 100644
--- a/03_sensing/README.md
+++ b/03_sensing/README.md
@@ -79,7 +79,7 @@
    ```python
        sources = [
            "colorful_light_demo.c",
-           # "enrionment_demo.c",
+           # "environment_demo.c",
            # "oled_demo.c", "oled_ssd1306.c"
        ]
    ```
diff --git a/03_sensing/envrionment_demo.c b/03_sensing/environment_demo.c
similarity index 100%
rename from 03_sensing/envrionment_demo.c
rename to 03_sensing/environment_demo.c