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-rw-r--r--src/vm.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/vm.c b/src/vm.c
index d09602075..ae2b7f120 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -328,7 +328,7 @@ vm_mark (SCM obj)
if (SCM_NIMP (*sp))
scm_gc_mark (*sp);
fp = SCM_VM_STACK_ADDRESS (sp[-1]); /* dynamic link */
- /* Mark frame variables + program */
+ /* Mark external link, frame variables, and program */
for (sp -= 2; sp >= lower; sp--)
if (SCM_NIMP (*sp))
scm_gc_mark (*sp);