diff --git a/README.md b/README.md
index 6e4b7cf..92e6fb7 100644
--- a/README.md
+++ b/README.md
@@ -21,6 +21,9 @@ Some of these things are taken from Alpine Linux's musl package.
 - `include/sys/queue.h`
 - `include/sys/tree.h`
 
+### GNU General Public License, v2 or later
+- `iconv.c`
+
 ## Related
 
 - [musl-fts](https://github.com/pullmoll/musl-fts)