diff --git a/lectures/04_pointers/README.md b/lectures/04_pointers/README.md
index 49a5526..4477753 100644
--- a/lectures/04_pointers/README.md
+++ b/lectures/04_pointers/README.md
@@ -25,7 +25,7 @@ cout << "Smaller\n";
 The output is Bigger
 because x == 72.0. What’s going on?
 
-![alt text](pointer_init.pdf "pointer_init")
+![alt text](pointer_init.png "pointer_init")
 
 ## 4.2 Pointer Variables and Memory Access
 
diff --git a/lectures/04_pointers/pointer_init.pdf b/lectures/04_pointers/pointer_init.pdf
deleted file mode 100755
index a0b8db1..0000000
Binary files a/lectures/04_pointers/pointer_init.pdf and /dev/null differ