diff --git a/hledger/hledger.m4.md b/hledger/hledger.m4.md
index 33278b7cd..b314e3b2a 100644
--- a/hledger/hledger.m4.md
+++ b/hledger/hledger.m4.md
@@ -258,6 +258,10 @@ _reportingoptions_
 Here are some details useful to know about for hledger command lines (and elsewhere).
 Feel free to skip this section until you need it.
 
+## Option repetition
+
+If options are repeated in a command line, hledger will generally use the last (right-most) occurence.
+
 ## Special characters
 
 ### Single escaping (shell metacharacters)