diff --git a/GNUmakefile b/GNUmakefile
index 68b4ef2..955a73a 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -176,7 +176,7 @@ INCLUDES=buffer.h byte.h fmt.h ip4.h ip6.h mmap.h scan.h socket.h str.h stralloc
 uint16.h uint32.h uint64.h open.h textcode.h tai.h taia.h dns.h iopause.h case.h \
 openreadclose.h readclose.h ndelay.h array.h io.h safemult.h iob.h havealloca.h \
 errmsg.h cdb.h cdb_make.h rangecheck.h iarray.h va_narg.h isset.h \
-compiletimeassert.h
+compiletimeassert.h critbit.h
 
 install-inc:
 	install -d $(INCLUDEDIR)
diff --git a/critbit/critbit0_allprefixed.3 b/critbit/critbit0_allprefixed.3
index e095de8..ba64aac 100644
--- a/critbit/critbit0_allprefixed.3
+++ b/critbit/critbit0_allprefixed.3
@@ -21,6 +21,9 @@ returns 1 if all keys with the given prefix were handled.
 
 If \fIhandle\fR returns something else, the search stops and
 critbit0_allprefixed returns -1.
+.SH "NOTE"
+This function uses recursion to traverse the tree. It may require
+nontrivial amounts of available stack space.
 .SH "RETURN VALUE"
 1 if all keys were found and handled (or if there were no keys with that
 prefix).
diff --git a/critbit/critbit0_clear.3 b/critbit/critbit0_clear.3
index 486bbb7..4799470 100644
--- a/critbit/critbit0_clear.3
+++ b/critbit/critbit0_clear.3
@@ -10,6 +10,9 @@ void \fBcritbit0_clear\fP(critbit0_tree* \fIcb\fR);
 .SH DESCRIPTION
 critbit0_clear deletes all keys in \fIcb\fR and frees all memory
 associated with it.
+.SH "NOTE"
+This function uses recursion to traverse the tree. It may require
+nontrivial amounts of available stack space.
 .SH "RETURN VALUE"
 none.
 .SH "SEE ALSO"
diff --git a/critbit/critbit0_insert.3 b/critbit/critbit0_insert.3
index 13b409a..bc7b0c5 100644
--- a/critbit/critbit0_insert.3
+++ b/critbit/critbit0_insert.3
@@ -8,7 +8,9 @@ critbit0_tree cb = { 0 };
 
 int \fBcritbit0_insert\fP(critbit0_tree* \fIcb\fR,const char* \fIstr\fR);
 .SH DESCRIPTION
-critbit0_insert attempts to insert a string into a critbit0 tree.
+critbit0_insert attempts to insert a string into a critbit0 tree. For
+this it does not insert a copy of the pointer but makes a copy of the
+whole string.
 If \fIstr\fR is already in \fIcb\fR, critbit0_insert returns 1.
 If \fIstr\fR is not in \fIcb\fR, it is inserted and critbit0_insert
 returns 2.