diff --git a/src/libutil/tarfile.cc b/src/libutil/tarfile.cc
index c00673182..79fb9f721 100644
--- a/src/libutil/tarfile.cc
+++ b/src/libutil/tarfile.cc
@@ -22,7 +22,6 @@ void unpackTarfile(const Path & tarFile, const Path & destDir,
     auto source = sinkToSource([&](Sink & sink) {
         // FIXME: look at first few bytes to determine compression type.
         auto decompressor =
-            // FIXME: add .gz support
             hasSuffix(*baseName, ".bz2") ? makeDecompressionSink("bzip2", sink) :
             hasSuffix(*baseName, ".gz") ? makeDecompressionSink("gzip", sink) :
             hasSuffix(*baseName, ".xz") ? makeDecompressionSink("xz", sink) :