1 files changed, 2 insertions, 0 deletions
diff --git a/validate.c b/validate.c
index 1cc1901f..725041e1 100644
--- a/validate.c
+++ b/validate.c
@@ -22,6 +22,8 @@
 
 #include "private.h"
 
+/* FIXME: .Bl -diag can't have non-text children in HEAD. */
+
 /*
  * Pre- and post-validate macros as they're parsed.  Pre-validation
  * occurs when the macro has been detected and its arguments parsed.