diff --git a/application.c b/application.c
index 0ceda52..f8d006d 100644
--- a/application.c
+++ b/application.c
@@ -87,18 +87,18 @@ size_t putc(char c)
 	return length; // return number of characters printed
 }
 
-/** print voltage with fixed precision
- *  @param[in] voltage voltage to print
+/** print float with fixed precision
+ *  @param[in] fpu float to print
  *  @param[in] precision number of digits after comma to print
  *  @note %f is used to force scientific notation
  */
-static void print_fpu(double voltage, uint8_t precision)
+static void print_fpu(double fpu, uint8_t precision)
 {
 	uint32_t multiplier = 1;
 	for (uint8_t i = 0; i < precision; i++) {
 		multiplier *= 10;
 	}
-	double to_print = round(voltage * multiplier);
+	double to_print = round(fpu * multiplier);
 	printf("%d.", (int32_t)to_print / multiplier);
 	char decimal[32];
 	snprintf(decimal, LENGTH(decimal), "%u", abs(to_print) % multiplier);