diff --git a/README.md b/README.md
index 3874485..c4060fc 100644
--- a/README.md
+++ b/README.md
@@ -13,7 +13,7 @@ Thanks also to [distri's squashfs library](https://github.com/distr1/distri/tree
 
 ## Build tags
 
-This library has two optional build tags. `no_gpl` disables the ability to read archives with lzo compression due to the library's gpl license. `no_obsolete` removes "obsolete" compression types for a reduced size; currently this only disable lzma compression.
+This library has two optional build tags. `no_gpl` disables the ability to read archives with lzo compression due to the library's gpl license. `no_obsolete` removes "obsolete" compression types for a reduced compilation size; currently this only disable lzma compression since it's superseded by xz.
 
 ## FUSE
 
diff --git a/internal/decompress/lzma.go b/internal/decompress/lzma.go
index 74603f9..8fa1e3c 100644
--- a/internal/decompress/lzma.go
+++ b/internal/decompress/lzma.go
@@ -1,4 +1,4 @@
-//go:build !no_lzma
+//go:build !no_obsolete
 
 package decompress
 
diff --git a/internal/decompress/lzo.go b/internal/decompress/lzo.go
index fd8d650..b708f50 100644
--- a/internal/decompress/lzo.go
+++ b/internal/decompress/lzo.go
@@ -1,4 +1,4 @@
-//go:build !no_lzo
+//go:build !no_gpl
 
 package decompress