diff --git a/01-g-h-filter.ipynb b/01-g-h-filter.ipynb
index b2b4277..c5bfc33 100644
--- a/01-g-h-filter.ipynb
+++ b/01-g-h-filter.ipynb
@@ -3394,7 +3394,7 @@
     "```python\n",
     "gain_rate = gain_rate\n",
     "``` \n",
-    "This obviously has no effect, and can be removed. I wrote this to emphasize that in the prediction step you need to predict next value for all variables, both `weight` and `gain_rate`. In this case we are assuming that the gain does not vary, but when we generalize this algorithm we will remove that assumption. "
+    "This obviously has no effect, and can be removed. I wrote this to emphasize that in the prediction step you need to predict the next value for all variables, both `weight` and `gain_rate`. In this case we are assuming that the gain does not vary, but when we generalize this algorithm we will remove that assumption. "
    ]
   },
   {