diff --git a/01_intro.ipynb b/01_intro.ipynb
index 7511d20..1806514 100644
--- a/01_intro.ipynb
+++ b/01_intro.ipynb
@@ -923,7 +923,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "There a number of powerful concepts embedded in this short statement: \n",
+    "There are a number of powerful concepts embedded in this short statement: \n",
     "\n",
     "- the idea of a \"weight assignment\" \n",
     "- the fact that every weight assignment has some \"actual performance\"\n",
@@ -2932,4 +2932,4 @@
  },
  "nbformat": 4,
  "nbformat_minor": 4
-}
+}
\ No newline at end of file