diff --git a/src/cpuusagebuffer.rs b/src/cpuusagebuffer.rs
index 0b73f36..aea58b3 100644
--- a/src/cpuusagebuffer.rs
+++ b/src/cpuusagebuffer.rs
@@ -42,10 +42,10 @@ fn shift_braille_one_col(b: u8) -> u8 {
 }
 
 fn cpu_usages_to_braille(a: u32, b: u32) -> u8 {
-    let ab = cpu_usage_to_braille(a);
-    let bb = cpu_usage_to_braille(b);
+    let a_braille = cpu_usage_to_braille(a);
+    let b_braille = cpu_usage_to_braille(b);
 
-    ab + shift_braille_one_col(bb)
+    a_braille + shift_braille_one_col(b_braille)
 }
 
 impl CpuUsageBuffer {