Update src/libstore/binary-cache-store.cc

Co-authored-by: Eelco Dolstra <edolstra@gmail.com>

src/libstore/binary-cache-store.cc

@@ -315,7 +315,7 @@ StorePath BinaryCacheStore::addToStoreFromDump(
     std::string nar;
 
     // Calculating Git hash from NAR stream not yet implemented. May not
-    // be possible to implement in single-pass in NAR is in an
+    // be possible to implement in single-pass if NAR is in an
     // inconvenient order. Could fetch after uploading, however.
     if (hashMethod.getFileIngestionMethod() == FileIngestionMethod::Git)
         unsupported("addToStoreFromDump");