diff --git a/pgpainless-core/src/main/java/org/pgpainless/policy/Policy.java b/pgpainless-core/src/main/java/org/pgpainless/policy/Policy.java
index 669dbfc5..97ef898a 100644
--- a/pgpainless-core/src/main/java/org/pgpainless/policy/Policy.java
+++ b/pgpainless-core/src/main/java/org/pgpainless/policy/Policy.java
@@ -400,6 +400,7 @@ public final class Policy {
          *
          * @see <a href="https://www.bsi.bund.de/SharedDocs/Downloads/EN/BSI/Publications/TechGuidelines/TG02102/BSI-TR-02102-1.pdf">
          *     BSI - Technical Guideline - Cryptographic Mechanisms: Recommendations and Key Lengths (2021-01)</a>
+         * @see <a href="https://www.keylength.com/">BlueKrypt | Cryptographic Key Length Recommendation</a>
          *
          * @return default algorithm policy
          */