diff --git a/libexec/portzap/functions/print.sh b/libexec/portzap/functions/print.sh
index b5d395f..fb27aff 100755
--- a/libexec/portzap/functions/print.sh
+++ b/libexec/portzap/functions/print.sh
@@ -2,10 +2,10 @@
 
 printok()
 {
-    printf "ok: %s\n" "${1}" > /dev/stdout
+    printf "portzap: %s\n" "${1}" > /dev/stdout
 }
 
 printerr()
 {
-    printf "error: %s\n" "${1}" > /dev/stderr
+    printf "portzap: %s\n" "${1}" > /dev/stderr
 }
diff --git a/share/portzap/CHANGELOG b/share/portzap/CHANGELOG
index 6782e6d..def32c0 100644
--- a/share/portzap/CHANGELOG
+++ b/share/portzap/CHANGELOG
@@ -2,6 +2,10 @@
 
 * vNEXT
 
+**** Format log messages with program name
+This change formats log messages written to standard output
+and standard error with the pattern ~portzap: <message>~
+
 **** Fix typo in ~commands/portzap-setup~
 This change fixes a typo that would throw an error when
 running the ~portzap setup~ command