diff --git a/src/utilmoneystr.h b/src/utilmoneystr.h
index 5839b073447..bc885ee1675 100644
--- a/src/utilmoneystr.h
+++ b/src/utilmoneystr.h
@@ -14,6 +14,9 @@
 
 #include "amount.h"
 
+/* Do not use these functions to represent or parse monetary amounts to or from
+ * JSON but use AmountFromValue and ValueFromAmount for that.
+ */
 std::string FormatMoney(const CAmount& n);
 bool ParseMoney(const std::string& str, CAmount& nRet);
 bool ParseMoney(const char* pszIn, CAmount& nRet);