diff --git a/src/ap/acs.c b/src/ap/acs.c
index 6003f0e38..c38d3632b 100644
--- a/src/ap/acs.c
+++ b/src/ap/acs.c
@@ -76,7 +76,7 @@
  *
  * This corresponds to:
  * ---
- * (busy time - tx time) / (active time - tx time) * 2^(chan_nf + band_min_nf)
+ * (busy time - tx time) / (active time - tx time) * 2^(chan_nf - band_min_nf)
  * ---
  *
  * The coefficient of 2 reflects the way power in "far-field"
@@ -93,7 +93,7 @@
  * calculated easily.
  * ---
  * (busy time - tx time) / (active time - tx time) *
- *    2^(10^(chan_nf/10) + 10^(band_min_nf/10))
+ *    2^(10^(chan_nf/10) - 10^(band_min_nf/10))
  * ---
  *
  * However to account for cases where busy/rx time is 0 (channel load is then
@@ -101,7 +101,7 @@
  * channel with lower noise floor is preferred. The equation becomes:
  * ---
  * 10^(chan_nf/5) + (busy time - tx time) / (active time - tx time) *
- *    2^(10^(chan_nf/10) + 10^(band_min_nf/10))
+ *    2^(10^(chan_nf/10) - 10^(band_min_nf/10))
  * ---
  *
  * All this "interference factor" is purely subjective and only time