diff --git a/AUTHORS b/AUTHORS
index 6bf37887..ddcbffb7 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -126,3 +126,4 @@ Thanks to the following, who submitted detailed bug reports and excellent sugges
   Joachim Meyer
   arxel-sc
   Eugene Morozov
+  Stefan Herold
diff --git a/ChangeLog b/ChangeLog
index f7272bb4..9fa9c921 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,6 @@
+- #600    Add retag command to internal help
+          (thanks to Stefan Herold)
+
 ------ current release ---------------------------
 
 1.7.1 (2024-01-16) - 2514d506b5580154f1e00c0e72b17c8e9bc89cb7
diff --git a/src/commands/CmdHelp.cpp b/src/commands/CmdHelp.cpp
index 6b9b8252..608dc6c0 100644
--- a/src/commands/CmdHelp.cpp
+++ b/src/commands/CmdHelp.cpp
@@ -55,6 +55,7 @@ int CmdHelpUsage (const Extensions& extensions)
             << "       timew month [<interval>] [<tag> ...]\n"
             << "       timew move @<id> <date>\n"
             << "       timew [report] <report> [<interval>] [<tag> ...]\n"
+            << "       timew retag @<id> [@<id> ...] <tag> [<tag> ...]\n"
             << "       timew shorten @<id> [@<id> ...] <duration>\n"
             << "       timew show\n"
             << "       timew split @<id> [@<id> ...]\n"