diff --git a/README.adoc b/README.adoc
index aae6fef..601a854 100644
--- a/README.adoc
+++ b/README.adoc
@@ -77,7 +77,9 @@ Since we need Lua 5.3 features (64-bit integers), LuaJIT can't help us here.
 
 Similar software
 ----------------
-https://codisec.com/veles/ can also highlight files but it's not scriptable.
+ * https://codisec.com/veles/ can also highlight files but it's not scriptable
+ * https://bitbucket.org/haypo/hachoir/wiki/Home seems to be strictly
+   hierarchical, which may not work for file formats like ELF
 
 Contributing and Support
 ------------------------