diff --git a/pgpainless-core/src/main/java/org/pgpainless/signature/SelectSignatureFromKey.java b/pgpainless-core/src/main/java/org/pgpainless/signature/SelectSignatureFromKey.java
index b1dca645..0ccaed34 100644
--- a/pgpainless-core/src/main/java/org/pgpainless/signature/SelectSignatureFromKey.java
+++ b/pgpainless-core/src/main/java/org/pgpainless/signature/SelectSignatureFromKey.java
@@ -59,7 +59,7 @@ public abstract class SelectSignatureFromKey {
      * Criterion that checks if the signature is valid at the validation date.
      * A signature is not valid if it was created after the validation date, or if it is expired at the validation date.
      *
-     * creationTime <= validationDate < expirationDate.
+     * creationTime less than or equal validationDate less than expirationDate.
      *
      * @param validationDate validation date
      * @return criterion implementation