diff --git a/man1/pkgfoster.1 b/man1/pkgfoster.1
index 523a10a..0ee3e5e 100644
--- a/man1/pkgfoster.1
+++ b/man1/pkgfoster.1
@@ -10,24 +10,25 @@
 .fam T
 .fi
 .SH DESCRIPTION
-\fBpkgfoster\fP is a simple interactive script you can use to clean up orphaned packages (i.e.,
-packages not listed in the "Depends on: " line of any other installed package). It uses
-prt-cache by default, so remember to build the cache with "prt-get cache". You can also
-use normal prt-get by modifying the PRT_GET variable. The bash array FOSTERED
-is read from and written to ~/.config/pkgfoster.conf, as a means of preserving your choices
-regarding which packages to keep. If you run \fBpkgfoster\fP as a non-root user, make sure the user
-is able to elevate permissions using sudo, doas, or 'su -c'.
+\fBpkgfoster\fP is a simple interactive script you can use to clean up orphaned
+packages (i.e., packages not listed in the "Depends on: " line of any other installed
+package). It uses prt-cache by default, so remember to build the cache with "prt-get
+cache". You can also use normal prt-get by modifying the PRT_GET variable. The file
+~/.config/pkgfoster.keep is used to preserve your decisions regarding which packages
+to keep. If you run \fBpkgfoster\fP as a non-root user, make sure the user is able to
+elevate permissions using sudo, doas, or 'su -c'.
 .PP
 Packages from the core collection are never considered for deletion, since some of them
 might provide runtime dependencies yet not be listed in the "Depends on: " line. See
 \fBPkgfile\fP(5) for an explanation of this practice.
 .PP
-Some packages flagged by \fBpkgfoster\fP might actually be optional (soft) dependencies of other
-packages on your system. Use \fBrevdep\fP(1) to identify any breakage that you introduce by
-removing these misidentified orphans, and rebuild the affected ports using
+Some packages flagged by \fBpkgfoster\fP might actually be optional (soft)
+dependencies of other packages on your system. Use \fBrevdep\fP(1) to identify any
+breakage that you introduce by removing these misidentified orphans, and rebuild the
+affected ports using
 .B prt\-get update \-fr
 (see \fBprt\-get\fP(8) for more detailed examples).
 .SH AUTHORS
 Jukka Heino <jukka@karsikkopuu.net>
 .SH SEE ALSO
-\fBprt\-cache\fP(8), \fBprt\-get\fP(8), \fBrevdep\fP(1)
+\fBprt\-cache\fP(8), \fBprt\-get\fP(8), \fBPkgfile\fP(5), \fBrevdep\fP(1)
diff --git a/scripts/pkgfoster b/scripts/pkgfoster
index 64f05b3..69e4777 100755
--- a/scripts/pkgfoster
+++ b/scripts/pkgfoster
@@ -4,11 +4,11 @@
 # Jukka Heino <jukka@karsikkopuu.net>
 #
 # pkgfoster is a simple script you can use to clean up orphaned packages (i.e. 
-# packages which no other package depends on). It uses prt-cache by default, so 
-# remember to build the cache with "prt-get cache". You can also use normal 
-# prt-get by modifying the PRT_GET variable. An array of packages to keep 
-# is stored in the FOSTERED variable. Packages from core are never considered
-# for deletion.
+# packages which do not appear in the "Depends on: " line of any other installed
+# package). It uses prt-cache by default, so remember to build the cache with
+# "prt-get cache". You can also use normal prt-get by modifying the PRT_GET
+# variable. The file ~/.config/pkgfoster.keep contains a list of all packages
+# you've decided to keep. Packages from core are never considered for deletion.
 #
 
 PRT_GET=prt-cache
@@ -26,17 +26,20 @@ else
 fi
 
 BASE=$(awk '/^[[:space:]]*prtdir.*\/core/ {print $2}' /etc/prt-get.conf)
-CONF=${XDG_CONFIG_HOME:="$HOME/.config"}/pkgfoster.conf
-[ -f $CONF ] && . $CONF || mkdir -p ${XDG_CONFIG_HOME}
+CONF="${XDG_CONFIG_HOME:="$HOME/.config"}/pkgfoster.keep"
+if [ ! -f "$CONF" ]; then
+	mkdir -p "${XDG_CONFIG_HOME}"
+	touch "$CONF"
+fi
 
 echo "Checking packages for orphans..."
 
 while true ; do
 	RECHECK=0
 
-	orphans=$(comm -13 <(cat <(find "$BASE" -maxdepth 1 -type d -printf "%f\n") \
-		<(for (( k=0; k<${#FOSTERED[@]}; k++ )); do echo "${FOSTERED[$k]}"; done) \
-		| sort -u) <($PRT_GET listorphans | sort) | tr '\n' ' ')
+	orphans=$(comm -23 <($PRT_GET listorphans | sort) \
+		<(cat <(find "$BASE" -maxdepth 1 -type d -printf "%f\n") "$CONF" \
+		| sort -u) | tr '\n' ' ')
 
 	for PACKAGE in ${orphans[@]}; do
 		echo
@@ -50,16 +53,11 @@ while true ; do
 			$PKGRM $PACKAGE
 			RECHECK=1
 		else
-			FOSTERED=( $PACKAGE ${FOSTERED[@]} )
+			echo $PACKAGE >> "$CONF"
 		fi
 	done
 
 	if [ "$RECHECK" = "0" ] ; then
-		echo -n "FOSTERED=(" > $CONF
-		for (( k=0; k<${#FOSTERED[@]}; k++ )); do
-			echo -n "${FOSTERED[$k]} " >> $CONF
-		done
-		echo ")" >> $CONF
 		exit 0
 	fi