diff --git a/taxonomy.md b/taxonomy.md
index 54838d382231c6bbe65a83347d7df42bdc76b7cc..b911a3e68ebd43d85640f9275ada704465c88fb0 100644
--- a/taxonomy.md
+++ b/taxonomy.md
@@ -13,7 +13,7 @@ legislation.
 
 # Things that are DOSP
 
-* Springing licenses that automatically convert after a particular delay
+* Springing licenses that automatically convert after a particular delay (but note that these can convert from proprietary to open source, like BUSL, or from one open source license to another, like BOSL)
 
 * A promise to (explicitly or manually) relicense older versions on a predictable schedule, when this promise is made and complied with