Added comment describing the unwind value.

.github/workflows/continuous-integration-workflow.yaml

@@ -106,10 +106,16 @@ jobs:
       - name: Verify with Kani
         uses: model-checking/[email protected]
         with:
+          enable-propproof: true
           args: |
             --tests -p prost-types --default-unwind 3 \
             --harness "tests::check_timestamp_roundtrip_via_system_time"
-          enable-propproof: true
+            # --default-unwind N roughly corresponds to how much effort
+            # Kani will spend trying to prove correctness of the
+            # program. Higher the number, more programs can be proven
+            # correct. However, Kani will require more time and memory. If
+            # Kani fails with "Failed Checks: unwinding assertion," this
+            # number may need to be raised for Kani to succeed.
 
   no-std:
     runs-on: ubuntu-latest