diff --git a/libc/Kconfig b/libc/Kconfig
index 2ee379ecf36..0a7a732ca44 100644
--- a/libc/Kconfig
+++ b/libc/Kconfig
@@ -270,13 +270,16 @@ config LIBC_LOCALTIME
 		localtime API call support
 
 		Logic currently depends on file system support with, at a minimum, these
-		files in the zoneinfo directory:  GMT and posixrules.
+		files in the zoneinfo directory:  GMT and posixrules.  An additional
+		timezone file is required for any another time zone and the environment
+		variable TZ must be set to the name of that file.
 
-		There is also an issue with mktime being called very early in
-		initialization by the OS before there are any file systems available.
+		There is an issue with mktime being called very early in initialization
+		by the OS before there are any file systems available.
 
-		And finally, the times presented by the NSH date command are wrong with
-		this logic is enabled.
+		And finally, the times presented by the NSH date command are wrong when
+		this logic is enabled.  I assume that this is due to some inconsistency
+		between the NuttX timing logic and the localtime timing logic.
 
 if LIBC_LOCALTIME