diff --git a/src/spellsuggest.c b/src/spellsuggest.c
index 42eb434..e1c303a 100644
--- a/src/spellsuggest.c
+++ b/src/spellsuggest.c
@@ -424,6 +424,7 @@
 	    if (*s != NUL && !VIM_ISDIGIT(*s))
 		f = -1;
 	}
+	// Note: Keep this in sync with p_sps_values.
 	else if (STRCMP(buf, "best") == 0)
 	    f = SPS_BEST;
 	else if (STRCMP(buf, "fast") == 0)