diff --git a/src/mesa/drivers/dri/i915/intel_fbo.h b/src/mesa/drivers/dri/i915/intel_fbo.h
index 906df4a6bc4..980726763ab 100644
--- a/src/mesa/drivers/dri/i915/intel_fbo.h
+++ b/src/mesa/drivers/dri/i915/intel_fbo.h
@@ -35,6 +35,9 @@ struct intel_region;
 
 /**
  * Intel renderbuffer, derived from gl_renderbuffer.
+ * Note: The PairedDepth and PairedStencil fields use renderbuffer IDs,
+ * not pointers because in some circumstances a deleted renderbuffer could
+ * result in a dangling pointer here.
  */
 struct intel_renderbuffer {
    struct gl_renderbuffer Base;