diff --git a/tests/tcctest.c b/tests/tcctest.c
index d2b71692..7f8ebfba 100644
--- a/tests/tcctest.c
+++ b/tests/tcctest.c
@@ -3321,6 +3321,9 @@ extern int bug_table[] __attribute__((section("__bug_table")));
 char * get_asm_string (void)
 {
 #ifdef __i386__
+  /* i386 is not currently tested because this code triggers a gcc
+     bug on some distributions. See
+     https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=946678 */
   char *str = "(not tested)";
 #else
   extern int some_symbol;