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-rw-r--r--src/libstore/gc.hh4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/libstore/gc.hh b/src/libstore/gc.hh
index 838188adeb82..c8f908b152aa 100644
--- a/src/libstore/gc.hh
+++ b/src/libstore/gc.hh
@@ -16,7 +16,9 @@ void collectGarbage(const PathSet & roots, GCAction action,
     PathSet & result);
 
 /* Register a temporary GC root.  This root will automatically
-   disappear when this process exits. */
+   disappear when this process exits.  WARNING: this function should
+   not be called inside a BDB transaction, otherwise we can
+   deadlock. */
 void addTempRoot(const Path & path);