diff --git a/src/gmni.c b/src/gmni.c
index 245ba76363b58e9c9ddbf87464d48cfb38463892..a61ee7bcb3ce77da24b1db97d379c2003c61d055 100644
--- a/src/gmni.c
+++ b/src/gmni.c
@@ -84,7 +84,8 @@ case TOFU_UNTRUSTED_CERT:
fprintf(stderr,
"The certificate offered by this server is of unknown trust. "
"Its fingerprint is: \n"
- "%s\n\n", fingerprint);
+ "%s\n\n"
+ "Use -j trust to trust temporarily, or -j always to add to the trust store.\n", fingerprint);
break;
case TOFU_FINGERPRINT_MISMATCH:
fprintf(stderr,