1 files changed, 1 insertions, 1 deletions
diff --git a/crypto/src/asn1/cmp/CrlSource.cs b/crypto/src/asn1/cmp/CrlSource.cs
index 61fc96b32..4b6b396d9 100644
--- a/crypto/src/asn1/cmp/CrlSource.cs
+++ b/crypto/src/asn1/cmp/CrlSource.cs
@@ -48,7 +48,7 @@ namespace Org.BouncyCastle.Asn1.Cmp
             }
             else
             {
-                throw new ArgumentException("unknown tag " + Asn1Utilities.GetTagText(taggedObject),
+                throw new ArgumentException("unknown tag: " + Asn1Utilities.GetTagText(taggedObject),
                     nameof(taggedObject));
             }
         }