diff --git a/src/libsystemd/sd-journal/journal-file.h b/src/libsystemd/sd-journal/journal-file.h
index 7a2c5cdcbee..cc2f41f634b 100644
--- a/src/libsystemd/sd-journal/journal-file.h
+++ b/src/libsystemd/sd-journal/journal-file.h
@@ -18,7 +18,7 @@
 #include "time-util.h"
 
 typedef struct JournalMetrics {
-        /* For all these: -1 means "pick automatically", and 0 means "no limit enforced" */
+        /* For all these: UINT64_MAX means "pick automatically", and 0 means "no limit enforced" */
         uint64_t max_size;     /* how large journal files grow at max */
         uint64_t min_size;     /* how large journal files grow at least */
         uint64_t max_use;      /* how much disk space to use in total at max, keep_free permitting */