diff --git a/docs/assets/dark/ground-floor-dark.png b/docs/assets/dark/ground-floor-dark.png
new file mode 100644
index 0000000..fd38e1a
Binary files /dev/null and b/docs/assets/dark/ground-floor-dark.png differ
diff --git a/docs/calculation-method/transmission/index.md b/docs/calculation-method/transmission/index.md
index 0881809..ae13254 100644
--- a/docs/calculation-method/transmission/index.md
+++ b/docs/calculation-method/transmission/index.md
@@ -261,6 +261,7 @@ $i\dots I$ — кількість шарів огороджувальної ко
 
 
 ![ground-floor-light.png](../../assets/light/ground-floor-light.png)
+![ground-floor-dark.png](../../assets/dark/ground-floor-dark.png)
 
 # Список використаних джерел