1 files changed, 17 insertions, 0 deletions
diff --git a/apps/nshlib/README.txt b/apps/nshlib/README.txt
index 11d692dc1..1e4731066 100644
--- a/apps/nshlib/README.txt
+++ b/apps/nshlib/README.txt
@@ -104,6 +104,23 @@ Conditional Command Execution
       [sequence of <cmd>]
     fi
 
+Looping
+^^^^^^^
+
+  while-do-done and until-do-done looping constructs are also supported.
+  These works from the command line but are primarily intended for use
+  within NSH scripts (see the sh command).  The syntax is as follows:
+
+    while <test-cmd>; do <cmd-sequence>; done
+
+        Execute <cmd-sequence> as long as <test-cmd> has an exit status of
+        zero.
+
+     until <test-cmd>; do <cmd-sequence>; done
+
+        Execute <cmd-sequence> as long as <test-cmd> has a non-zero exit
+        status.
+
 Built-In Variables
 ^^^^^^^^^^^^^^^^^^