diff --git a/doc/Guidebook.mn b/doc/Guidebook.mn
index c89ca0ba4..b78c8d166 100644
--- a/doc/Guidebook.mn
+++ b/doc/Guidebook.mn
@@ -5424,6 +5424,11 @@ for stone through termill, \(lqminor_troubles\(rq for blind through hallu,
 Allowed behaviors are \(lqalways\(rq, \(lqup\(rq, \(lqdown\(rq,
 \(lqchanged\(rq, a percentage or absolute number threshold, or
 text to match against.
+For the \fIhitpoints\fP field, the additional behavior \(lqcriticalhp\(rq
+is available.
+It overrides always, percentage threshold, and absolute threshold if
+hit points are at or below the \fImajor problem\fP threshold
+(which varies depending upon maximum hit points and experience level).
 .si
 .lp "*"
 \(lqalways\(rq will set the default attributes for that field.
@@ -5479,6 +5484,10 @@ it also matches when value is below or above.
 If the prefix is \(oq<\(cq or \(oq>\(cq, only match when strictly
 above or below.
 .lp "*"
+criticalhp only applies to the hitpoints field and when defined it
+takes precedence over other hitpints rules except \fIchanged\fP,
+\fIup\fP, or \fIdown\fP.
+.lp "*"
 text match sets the attribute when the field value
 matches the text.
 Text matches can only be used for \(lqalignment\(rq,
diff --git a/doc/fixes3-7-0.txt b/doc/fixes3-7-0.txt
index 34bb787ed..aacc24dd0 100644
--- a/doc/fixes3-7-0.txt
+++ b/doc/fixes3-7-0.txt
@@ -2197,6 +2197,9 @@ when a doppelganger takes on mplayer (fake hero) form, usually choose role
 can now write unknown spellbook without need of Luck when spell is known;
 	if spell becomes known without having read its book (potential divine
 	gift), writing the book while the spell is still fresh will succeed
+new status highlight rule type for hitpoints:  "criticalhp" rule overrides
+	hit point rules if current HP is so low that prayer will consider it
+	to be major problem; applies to hitpointbar as well as HP status
 
 
 Platform- and/or Interface-Specific New Features