diff --git a/README.md b/README.md
index 3082227..f7c01fe 100644
--- a/README.md
+++ b/README.md
@@ -27,7 +27,7 @@ The available commands are
 
 * `enstrophy`: to compute the enstrophy and various other observables. This
   command prints
-  ```step_index time average_alpha average_enstrophy average_alpha*enstrophy alpha enstrophy alpha*enstrophy```
+  ```step_index time average(alpha) average(alpha*enstrophy) average(enstrophy) alpha alpha*enstrophy enstrophy```
   where the averages are running averages over `print_freq` steps.
 
 * `uk`: to compute the Fourier transform of the solution.