diff --git a/sh/archive b/sh/archive
index e9650cd..ab15032 100755
--- a/sh/archive
+++ b/sh/archive
@@ -4,7 +4,9 @@
 # NO_DASH
 # NO_ASH
 
-archive() {
+archive() { ### @- create an archive file in one of a few formats.
+    ### borrowed from [prezto.](https://github.com/sorin-ionescu/prezto)
+
     #
     # Creates archive file
     #
diff --git a/sh/lsarchive b/sh/lsarchive
index a42861d..a19d290 100755
--- a/sh/lsarchive
+++ b/sh/lsarchive
@@ -4,7 +4,9 @@
 # NO_DASH
 # NO_ASH
 
-lsarchive() {
+lsarchive() { ### @- list the contents of an archive file in one of many formats.
+    ### borrowed from [prezto.](https://github.com/sorin-ionescu/prezto)
+
     #
     # Lists the contents of archives.
     #
diff --git a/sh/unarchive b/sh/unarchive
index 493c6fc..2b24ab4 100755
--- a/sh/unarchive
+++ b/sh/unarchive
@@ -4,7 +4,9 @@
 # NO_DASH
 # NO_ASH
 
-unarchive() {
+unarchive() { ### @- extract the contents of an archive file in one of many formats.
+    ### borrowed from [prezto.](https://github.com/sorin-ionescu/prezto)
+
     #
     # Extracts the contents of archives.
     #