diff --git a/bash/grains/grains.sh b/bash/grains/grains.sh
index 9fc364a..00856d4 100644
--- a/bash/grains/grains.sh
+++ b/bash/grains/grains.sh
@@ -23,7 +23,7 @@ then
     do
         grains_on_square=$(echo "2^($square-1)" | bc)
         
-        # use floating point arithmetic (bc)
+        # use arbitrary precision arithmetic using basic calculator (bc)
         total_grains=$(echo "$total_grains + $grains_on_square" | bc)
     done
     echo $total_grains