diff --git a/solutions/object_oriented_design/deck_of_cards/deck_of_cards.ipynb b/solutions/object_oriented_design/deck_of_cards/deck_of_cards.ipynb
index dc74543..45b217a 100644
--- a/solutions/object_oriented_design/deck_of_cards/deck_of_cards.ipynb
+++ b/solutions/object_oriented_design/deck_of_cards/deck_of_cards.ipynb
@@ -4,7 +4,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "This notebook was prepared by [Donne Martin](https://github.com/donnemartin). Source and license info is on [GitHub](https://github.com/donnemartin/system-design-primer-primer)."
+    "This notebook was prepared by [Donne Martin](https://github.com/donnemartin). Source and license info is on [GitHub](https://github.com/donnemartin/system-design-primer)."
    ]
   },
   {
diff --git a/solutions/object_oriented_design/hash_table/hash_map.ipynb b/solutions/object_oriented_design/hash_table/hash_map.ipynb
index b572889..92713d9 100644
--- a/solutions/object_oriented_design/hash_table/hash_map.ipynb
+++ b/solutions/object_oriented_design/hash_table/hash_map.ipynb
@@ -4,7 +4,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "This notebook was prepared by [Donne Martin](https://github.com/donnemartin). Source and license info is on [GitHub](https://github.com/donnemartin/system-design-primer-primer)."
+    "This notebook was prepared by [Donne Martin](https://github.com/donnemartin). Source and license info is on [GitHub](https://github.com/donnemartin/system-design-primer)."
    ]
   },
   {
diff --git a/solutions/object_oriented_design/lru_cache/lru_cache.ipynb b/solutions/object_oriented_design/lru_cache/lru_cache.ipynb
index 9801202..cd91da1 100644
--- a/solutions/object_oriented_design/lru_cache/lru_cache.ipynb
+++ b/solutions/object_oriented_design/lru_cache/lru_cache.ipynb
@@ -4,7 +4,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "This notebook was prepared by [Donne Martin](https://github.com/donnemartin). Source and license info is on [GitHub](https://github.com/donnemartin/system-design-primer-primer)."
+    "This notebook was prepared by [Donne Martin](https://github.com/donnemartin). Source and license info is on [GitHub](https://github.com/donnemartin/system-design-primer)."
    ]
   },
   {
diff --git a/solutions/object_oriented_design/online_chat/online_chat.ipynb b/solutions/object_oriented_design/online_chat/online_chat.ipynb
index 3e42f88..b9f84ef 100644
--- a/solutions/object_oriented_design/online_chat/online_chat.ipynb
+++ b/solutions/object_oriented_design/online_chat/online_chat.ipynb
@@ -4,7 +4,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "This notebook was prepared by [Donne Martin](https://github.com/donnemartin). Source and license info is on [GitHub](https://github.com/donnemartin/system-design-primer-primer)."
+    "This notebook was prepared by [Donne Martin](https://github.com/donnemartin). Source and license info is on [GitHub](https://github.com/donnemartin/system-design-primer)."
    ]
   },
   {
diff --git a/solutions/object_oriented_design/parking_lot/parking_lot.ipynb b/solutions/object_oriented_design/parking_lot/parking_lot.ipynb
index fa54386..4613b79 100644
--- a/solutions/object_oriented_design/parking_lot/parking_lot.ipynb
+++ b/solutions/object_oriented_design/parking_lot/parking_lot.ipynb
@@ -4,7 +4,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "This notebook was prepared by [Donne Martin](https://github.com/donnemartin). Source and license info is on [GitHub](https://github.com/donnemartin/system-design-primer-primer)."
+    "This notebook was prepared by [Donne Martin](https://github.com/donnemartin). Source and license info is on [GitHub](https://github.com/donnemartin/system-design-primer)."
    ]
   },
   {