diff --git a/lab1/Part2_Music_Generation.ipynb b/lab1/Part2_Music_Generation.ipynb
index b830fee2..3bf3c948 100644
--- a/lab1/Part2_Music_Generation.ipynb
+++ b/lab1/Part2_Music_Generation.ipynb
@@ -236,7 +236,7 @@
         "id": "tZfqhkYCymwX"
       },
       "source": [
-        "This gives us an integer representation for each character. Observe that the unique characters (i.e., our vocabulary) in the text are mapped as indices from 0 to `len(unique)`. Let's take a peek at this numerical representation of our dataset:"
+        "This gives us an integer representation for each character. Observe that the unique characters (i.e., our vocabulary) in the text are mapped as indices from 0 to `len(unique) - 1`. Let's take a peek at this numerical representation of our dataset:"
       ]
     },
     {
@@ -947,4 +947,4 @@
       ]
     }
   ]
-}
\ No newline at end of file
+}