Fix typo in LRU cache solution
diff --git a/solutions/object_oriented_design/lru_cache/lru_cache.ipynb b/solutions/object_oriented_design/lru_cache/lru_cache.ipynb
index 954108a019..980120295c 100644
--- a/solutions/object_oriented_design/lru_cache/lru_cache.ipynb
+++ b/solutions/object_oriented_design/lru_cache/lru_cache.ipynb
@@ -21,7 +21,7 @@
     "## Constraints and assumptions\n",
     "\n",
     "* What are we caching?\n",
-    "    * We are cahing the results of web queries\n",
+    "    * We are caching the results of web queries\n",
     "* Can we assume inputs are valid or do we have to validate them?\n",
     "    * Assume they're valid\n",
     "* Can we assume this fits memory?\n",
