2 files changed, 2 insertions, 0 deletions

diff --git a/mandoc.h b/mandoc.h
index f83154aa..fa301466 100644
--- a/mandoc.h
+++ b/mandoc.h
@@ -111,6 +111,7 @@ enum	mandocerr {
 
 	/* related to equations */
 	MANDOCERR_EQNARGS, /* bad equation macro arguments */
+	MANDOCERR_EQNNEST, /* too many nested equation defines */
 
 	/* related to tables */
 	MANDOCERR_TBL, /* bad table syntax */
diff --git a/read.c b/read.c
index ae6d098e..9dd982b9 100644
--- a/read.c
+++ b/read.c
@@ -153,6 +153,7 @@ static	const char * const	mandocerrs[MANDOCERR_MAX] = {
 
 	/* related to equations */
 	"bad equation macro syntax",
+	"too many nested equation defines",
 
 	/* related to tables */
 	"bad table syntax",