diff --git a/tools/estimate_gas_costs.sh b/tools/estimate_gas_costs.sh
index c8109d0..3981b9a 100755
--- a/tools/estimate_gas_costs.sh
+++ b/tools/estimate_gas_costs.sh
@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 
 # prints out estimated gas costs of contract functions.
-# runs the tests which estimate and print out gas costs and greps by gas costs.
+# runs the tests which estimate and print out gas costs. then greps test output for gas costs.
 
 cd truffle
 yarn test | grep "estimated gas cost"