diff --git a/src/sim.c b/src/sim.c
index f5a9262..0d5ec96 100644
--- a/src/sim.c
+++ b/src/sim.c
@@ -288,6 +288,7 @@ profile_t set_profile(char *prof_name, opt_t *opt){
         opt->flag |= SQ_RNA;
         return minion_rna004_rna_prof;
     }else if(strcmp(prof_name, "rna004-prom") == 0){
+        WARNING("%s","Parameters and models for rna004-prom are still crude.");
         opt->flag |= SQ_R10;
         opt->flag |= SQ_RNA;
         return prom_rna004_rna_prof;