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-rw-r--r--src/globals.hh3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/globals.hh b/src/globals.hh
index 910e47e01cdd..816cb4766efb 100644
--- a/src/globals.hh
+++ b/src/globals.hh
@@ -35,7 +35,8 @@ extern TableId dbSuccessors;
 
 /* dbSuccessorsRev :: Path -> [Path]
 
-   The reverse mapping of dbSuccessors.
+   The reverse mapping of dbSuccessors (i.e., it stores the
+   predecessors of a Nix expression).
 */
 extern TableId dbSuccessorsRev;