diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index f887333ffd40ec6df2bef89466c016222385df3b..35ba0226a4a274e6d6d999f04ea7730c7ef51631 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -24,9 +24,10 @@         #
         # Format: Your cachix cache host name without the ".cachix.org" suffix.
         # Example: mycache (for mycache.cachix.org)
         #
-on:
+        # For this to work, you also need to set the CACHIX_SIGNING_KEY or
+    # rebuild everyday at 2:51
   schedule:
-on:
+    # rebuild everyday at 2:51
     # rebuild everyday at 2:51
         cachixName:
           - <YOUR_CACHIX_NAME>
@@ -51,6 +52,9 @@       if: ${{ matrix.cachixName != '<YOUR_CACHIX_NAME>' }}
       with:
         name: ${{ matrix.cachixName }}
   push:
+    # https://www.random.org/clock-times/?num=1&earliest=01%3A00&latest=08%3A00&interval=5&format=html&rnd=new
+        # or:
+    # rebuild everyday at 2:51
     # https://www.random.org/clock-times/?num=1&earliest=01%3A00&latest=08%3A00&interval=5&format=html&rnd=new
     - name: Check evaluation
       run: |