diff --git a/build.zig b/build.zig
index 59af6a6..132a3d8 100644
--- a/build.zig
+++ b/build.zig
@@ -11,7 +11,7 @@ pub fn build(b: *Builder) void {
     // between Debug, ReleaseSafe, ReleaseFast, and ReleaseSmall.
     const mode = b.standardReleaseOptions();
 
-    const exe = b.addExecutable("zigraylib", "src/main.zig");
+    const exe = b.addExecutable("kble", "src/main.zig");
     exe.setTarget(target);
     exe.setBuildMode(mode);
     exe.install();
diff --git a/src/level.zig b/src/level.zig
index 6d96326..f536a67 100644
--- a/src/level.zig
+++ b/src/level.zig
@@ -10,6 +10,8 @@ width: u16,
 height: u16,
 buffer: []cell_t,
 
+/// Create structure and allocate required memory. The `buffer` array size will
+/// be equal to `width` times `height`.
 pub fn init(allocator: *std.mem.Allocator, width: u16, height: u16) !Self {
     var level = Self{
         .width = width,
@@ -20,6 +22,7 @@ pub fn init(allocator: *std.mem.Allocator, width: u16, height: u16) !Self {
     return level;
 }
 
+/// Free the level buffer.
 pub fn deinit(self: *Self, allocator: *std.mem.Allocator) void {
     allocator.free(self.buffer);
 }
diff --git a/src/vec2.zig b/src/vec2.zig
index 088edf0..27e4788 100644
--- a/src/vec2.zig
+++ b/src/vec2.zig
@@ -7,6 +7,7 @@ const Self = @This();
 x: i32,
 y: i32,
 
+/// Create a vector with `x` and `y` values.
 pub fn init(x: i32, y: i32) Self {
     return Self {
         .x = x,
@@ -14,6 +15,7 @@ pub fn init(x: i32, y: i32) Self {
     };
 }
 
+/// Return the sum of `self` and `other`.
 pub fn add(self: Self, other: Self) Self {
     return Self {
         .x = self.x + other.x,
@@ -21,6 +23,7 @@ pub fn add(self: Self, other: Self) Self {
     };
 }
 
+/// Return the difference between `self` and `other`.
 pub fn sub(self: Self, other: Self) Self {
     return Self {
         .x = self.x - other.x,