diff --git a/src/cmd/compile/internal/noder/unified.go b/src/cmd/compile/internal/noder/unified.go
index 6bc23cc5f92..a5f09748387 100644
--- a/src/cmd/compile/internal/noder/unified.go
+++ b/src/cmd/compile/internal/noder/unified.go
@@ -404,6 +404,7 @@ func readPackage(pr *pkgReader, importpkg *types.Pkg, localStub bool) {
 		r := pr.newReader(pkgbits.RelocMeta, pkgbits.PublicRootIdx, pkgbits.SyncPublic)
 
 		pkg := r.pkg()
+		// This error can happen if "go tool compile" is called with wrong "-p" flag, see issue #54542.
 		if pkg != importpkg {
 			base.ErrorfAt(base.AutogeneratedPos, errors.BadImportPath, "mismatched import path, have %q (%p), want %q (%p)", pkg.Path, pkg, importpkg.Path, importpkg)
 			base.ErrorExit()