1 files changed, 2 insertions, 2 deletions
diff --git a/lib9p/9p.c b/lib9p/9p.c
index 0ab940c..8633a44 100644
--- a/lib9p/9p.c
+++ b/lib9p/9p.c
@@ -52,8 +52,8 @@ ssize_t lib9p_validate(struct lib9p_ctx *ctx, uint8_t *net_bytes) {
 	/* Body */
 	struct _vtable_msg vtable = _lib9p_vtables[ctx->version].msgs[typ];
 	if (!vtable.validate)
-		return lib9p_errorf(ctx, LINUX_EOPNOTSUPP, "unknown message type %s",
-		                    lib9p_msg_type_str(typ));
+		return lib9p_errorf(ctx, LINUX_EOPNOTSUPP, "unknown message type: %s (protocol_version=%s)",
+		                    lib9p_msg_type_str(typ), lib9p_version_str(ctx->version));
 	if (vtable.validate(&subctx))
 		return -1;
 	assert(subctx.net_offset <= subctx.net_size);