diff --git a/src/cfgparse.c b/src/cfgparse.c
index dead21d..af72744 100644
--- a/src/cfgparse.c
+++ b/src/cfgparse.c
@@ -2136,7 +2136,7 @@
 			goto next_line;
 		}
 
-		/* .warning/.error/.notice */
+		/* .warning/.error/.notice/.diag */
 		if (*args[0] == '.') {
 			if (strcmp(args[0], ".alert") == 0) {
 				ha_alert("parsing [%s:%d]: '%s'.\n", file, linenum, args[1]);
@@ -2152,6 +2152,10 @@
 				ha_notice("parsing [%s:%d]: '%s'.\n", file, linenum, args[1]);
 				goto next_line;
 			}
+			else if (strcmp(args[0], ".diag") == 0) {
+				ha_diag_warning("parsing [%s:%d]: '%s'.\n", file, linenum, args[1]);
+				goto next_line;
+			}
 			else {
 				ha_alert("parsing [%s:%d]: unknown directive '%s'.\n", file, linenum, args[0]);
 				err_code |= ERR_ALERT | ERR_FATAL;