Add link to PR in comment

jlmelville · jlmelville · commit a9e62cbaefd5 · 2023-09-28T20:54:35.000-07:00
diff --git a/hnswlib/hnswlib.h b/hnswlib/hnswlib.h
@@ -1,7 +1,7 @@
 #pragma once
 
-// This allows others to provide their own error stream.
-// See RcppHNSW for a use case.
+// https://github.com/nmslib/hnswlib/pull/508
+// This allows others to provide their own error stream (e.g. RcppHNSW)
 #ifndef HNSWLIB_ERR_OVERRIDE
   #define HNSWERR std::cerr
 #else
