diff --git a/run-tests.php b/run-tests.php
index 43302d1b6f3..7dd0d7b07ce 100755
--- a/run-tests.php
+++ b/run-tests.php
@@ -771,12 +771,12 @@ Options:
                 seconds. The default value is 60 seconds, or 300 seconds when
                 testing for memory leaks.
 
-    --show-[all|php|skip|clean|exp|diff|out]
+    --show-[all|php|skip|clean|exp|diff|out|mem]
                 Show 'all' files, 'php' test file, 'skip' or 'clean' file. You
                 can also use this to show the output 'out', the expected result
-                'exp' or the difference between them 'diff'. The result types
-                get written independent of the log format, however 'diff' only
-                exists when a test fails.
+                'exp', the difference between them 'diff' or the valgrind log
+                'mem'. The result types get written independent of the log format,
+                however 'diff' only exists when a test fails.
 
     --show-slow [n]
                 Show all tests that took longer than [n] milliseconds to run.