diff --git a/12-Particle-Filters.ipynb b/12-Particle-Filters.ipynb
index eb33a9d..41b2365 100644
--- a/12-Particle-Filters.ipynb
+++ b/12-Particle-Filters.ipynb
@@ -1608,7 +1608,7 @@
    "source": [
     "### Systematic Resampling\n",
     "\n",
-    "The last algorithm we will look at is systemic resampling. As with stratified resampling the space is divided into $N$ divisions. We then choose a random offset to use for all of the divisions, ensuring that each particle is exactly $\\frac{1}{N}$ apart. It looks like this."
+    "The last algorithm we will look at is systemic resampling. As with stratified resampling the space is divided into $N$ divisions. We then choose a random offset to use for all of the divisions, ensuring that each sample is exactly $\\frac{1}{N}$ apart. It looks like this."
    ]
   },
   {
@@ -1810,7 +1810,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.5.0"
+   "version": "3.5.1"
   }
  },
  "nbformat": 4,