diff --git a/SC3013.md b/SC3013.md
index 64be877..274b930 100644
--- a/SC3013.md
+++ b/SC3013.md
@@ -34,7 +34,7 @@ fi
 
 ### Rationale:
 
-`test -nt` is an extension in ksh, bash and dash, but it is not covered by POSIX.
+`test -nt` is an extension in ksh, bash and dash, but it is [not specified by POSIX](https://pubs.opengroup.org/onlinepubs/9699919799/utilities/test.html).
 
 ### Exceptions:
 
@@ -46,4 +46,6 @@ warnings.
 
 ### Related resources:
 
-* [Greg's Wiki - Bashism - Conditionals](https://mywiki.wooledge.org/Bashism#Conditionals)
+* Greg's Wiki
+    * [BashFAQ #3: How can I sort or compare files based on some metadata attribute (newest / oldest modification time, size, etc)?](https://mywiki.wooledge.org/BashFAQ/003)
+    * [Bashism - Conditionals](https://mywiki.wooledge.org/Bashism#Conditionals)