diff --git a/action.yml b/action.yml
index 7eb11cc..a8906ba 100644
--- a/action.yml
+++ b/action.yml
@@ -12,6 +12,10 @@ inputs:
     description: 'cfssl pki API port'
     default: '444'
     required: false
+  debug:
+    description: "show debug information about certificate truststore content"
+    required: false
+    default: "false"
 outputs:
   ca-cert:
     value: "${{ steps.retrieve-ca-cert.outputs.ca-cert }}"
@@ -34,3 +38,10 @@ runs:
         echo "EOF" >> "$GITHUB_OUTPUT"
         
         echo "ca-cert-base64=$ca_cert_base64" >> "$GITHUB_OUTPUT"
+
+    - name: Show retrieve root CA cert
+      if: ${{ inputs.debug == 'true' }}
+      shell: bash
+      run: |
+        echo "${{ steps.retrieve-ca-cert.outputs.ca-cert }}"
+        echo "${{ steps.retrieve-ca-cert.outputs.ca-cert-base64 }}"