diff --git a/aes-encrypt.c b/aes-encrypt.c
index 30511793831190f8c90187abd911f3e2bac40463..95149c57516c08f1607e3d39de4bfbf56520b08b 100644
--- a/aes-encrypt.c
+++ b/aes-encrypt.c
@@ -351,6 +351,11 @@ _aes_encrypt_table =
     }
   };
 
+/* On my sparc, encryption is significantly slower than decryption,
+ * even though the *only* difference is which table is passed to _aes_crypt.
+ *
+ * Really strange.
+ */
 void
 aes_encrypt(struct aes_ctx *ctx,
 	    unsigned length, uint8_t *dst,