diff --git a/src/consts.rs b/src/consts.rs
index d0a7e8f..05b0cd1 100644
--- a/src/consts.rs
+++ b/src/consts.rs
@@ -1,14 +1,20 @@
-pub const QOI_INDEX: u8 = 0x00;
-pub const QOI_RUN_8: u8 = 0x40;
-pub const QOI_RUN_16: u8 = 0x60;
-pub const QOI_DIFF_8: u8 = 0x80;
-pub const QOI_DIFF_16: u8 = 0xc0;
-pub const QOI_DIFF_24: u8 = 0xe0;
-pub const QOI_COLOR: u8 = 0xf0;
+// 2-bit tag
+pub const QOI_INDEX: u8 = 0x00; // (00)000000
+pub const QOI_DIFF_8: u8 = 0x80; // (10)000000
 
-pub const QOI_MASK_2: u8 = 0xc0;
-pub const QOI_MASK_3: u8 = 0xe0;
-pub const QOI_MASK_4: u8 = 0xf0;
+// 3-bit tag
+pub const QOI_RUN_8: u8 = 0x40; // (010)00000
+pub const QOI_RUN_16: u8 = 0x60; // (011)00000
+pub const QOI_DIFF_16: u8 = 0xc0; // (110)00000
+
+// 4-bit tag
+pub const QOI_DIFF_24: u8 = 0xe0; // (1110)0000
+pub const QOI_COLOR: u8 = 0xf0; // (1111)0000
+
+// tag masks
+pub const QOI_MASK_2: u8 = 0xc0; // (11)000000
+pub const QOI_MASK_3: u8 = 0xe0; // (111)00000
+pub const QOI_MASK_4: u8 = 0xf0; // (1111)0000
 
 pub const QOI_HEADER_SIZE: usize = 14;
 pub const QOI_PADDING: usize = 4;