diff --git a/sel4test-sim/README.md b/sel4test-sim/README.md
index a2cf3871..ee602e23 100644
--- a/sel4test-sim/README.md
+++ b/sel4test-sim/README.md
@@ -61,7 +61,7 @@ jobs:
     steps:
     strategy:
           matrix:
-            march: ["armv7a, armv8a", nehalem, rv32imac, rv64imac]
+            march: [armv7a, armv8a, nehalem, rv32imac, rv64imac]
             compiler: [gcc, clang]
     steps:
     - uses: seL4/ci-actions/sel4test-sim@master
diff --git a/sel4test-sim/action.yml b/sel4test-sim/action.yml
index 49bcf188..0dd325b9 100644
--- a/sel4test-sim/action.yml
+++ b/sel4test-sim/action.yml
@@ -19,7 +19,7 @@ inputs:
     description: Comma separated list of modes (32/64) to filter test configs on.
     required: false
   compiler:
-    description: One of `{gcc, clang} to filter test configs on`
+    description: One of `{gcc, clang}` to filter test configs on.
     required: false
   xml:
     description: sel4test xml manifest to test