diff --git a/README.md b/README.md
index 5779ef1..26faa22 100644
--- a/README.md
+++ b/README.md
@@ -54,7 +54,7 @@ Make sure you read through the [Hardware Simulator Tutorial][s] to understand th
 
 ## [Project 3: Machine Language Programming](https://www.nand2tetris.org/project03)
 
-Counting number of instructions by `wc -l file.hack`
+Counting number of instructions by `wc -l $file.hack`
 
 - [x] Mult (18)
-- [ ] Fill
+- [x] Fill (98)
diff --git a/projects/04/fill/manual-fill.hack b/projects/04/fill/manual-fill.hack
new file mode 100644
index 0000000..f4d7676
--- /dev/null
+++ b/projects/04/fill/manual-fill.hack
@@ -0,0 +1,96 @@
+0000000000000000
+1110110000010000
+1110001110010000
+0000000000010000
+1110001100001000
+0000000011111111
+1110110000010000
+0000000000010001
+1110001100001000
+0100000000000000
+1110110000010000
+0000000000000000
+1110001100001000
+0000000000010000
+1111110000010000
+0000000000000000
+1111110000100000
+1110001100001000
+1110110111100000
+1110001100001000
+1110110111100000
+1110001100001000
+1110110111100000
+1110001100001000
+1110110111100000
+1110001100001000
+1110110111100000
+1110001100001000
+1110110111100000
+1110001100001000
+1110110111100000
+1110001100001000
+1110110111100000
+1110001100001000
+1110110111100000
+1110001100001000
+1110110111100000
+1110001100001000
+1110110111100000
+1110001100001000
+1110110111100000
+1110001100001000
+1110110111100000
+1110001100001000
+1110110111100000
+1110001100001000
+1110110111100000
+1110001100001000
+1110110111100000
+1110001100001000
+1110110111100000
+1110001100001000
+1110110111100000
+1110001100001000
+1110110111100000
+1110001100001000
+1110110111100000
+1110001100001000
+1110110111100000
+1110001100001000
+1110110111100000
+1110001100001000
+1110110111100000
+1110001100001000
+1110110111100000
+1110001100001000
+1110110111100000
+1110001100001000
+1110110111100000
+1110001100001000
+1110110111100000
+1110001100001000
+1110110111100000
+1110001100001000
+1110110111100000
+1110001100001000
+1110110111100000
+1110001100001000
+1110110111100000
+1110001100001000
+1110110111100000
+1110110000010000
+0000000000000000
+1110001100001000
+0000000000010001
+1111110010001000
+0000000000010001
+1111110000010000
+0000000001011100
+1110001100000001
+0000000001011110
+1110101010000111
+0000000000001101
+1110101010000111
+0000000001011110
+1110101010000111