diff --git a/hledger/hledger.m4.md b/hledger/hledger.m4.md
index 2240f89d0..21e9be63b 100644
--- a/hledger/hledger.m4.md
+++ b/hledger/hledger.m4.md
@@ -4291,7 +4291,11 @@ Balance changes in 2016-02-01-2016-02-03:
 Letters:
 
 ```timedot
-# Activity types: cleanup, enhancement, learning, support
+# Activity types:
+#  c cleanup/catchup/repair
+#  e enhancement
+#  s support
+#  l learning/research
 
 2023-11-01
 work:adm  ccecces