diff --git a/git-pull.sh b/git-pull.sh
index 9868a0b..f3b4c93 100755
--- a/git-pull.sh
+++ b/git-pull.sh
@@ -39,7 +39,7 @@ test -z "$(git ls-files -u)" || die_conflict
 test -f "$GIT_DIR/MERGE_HEAD" && die_merge
 
 strategy_args= diffstat= no_commit= squash= no_ff= ff_only=
-log_arg= verbosity= progress= recurse_submodules=
+log_arg= verbosity= progress= recurse_submodules= must_be_signed=
 merge_args=
 curr_branch=$(git symbolic-ref -q HEAD)
 curr_branch_short="${curr_branch#refs/heads/}"
@@ -60,6 +60,8 @@ do
 		diffstat=--no-stat ;;
 	--stat|--summary)
 		diffstat=--stat ;;
+	--require-signature)
+		must_be_signed=yes ;;
 	--log|--no-log)
 		log_arg=$1 ;;
 	--no-c|--no-co|--no-com|--no-comm|--no-commi|--no-commit)
@@ -208,6 +210,27 @@ orig_head=$(git rev-parse -q --verify HEAD)
 git fetch $verbosity $progress $dry_run $recurse_submodules --update-head-ok "$@" || exit 1
 test -z "$dry_run" || exit 0
 
+if test -n "$must_be_signed"
+then
+	signature=$(git show -s --format='%G?' FETCH_HEAD)
+	case "$signature" in
+	G)
+		case "$verbosity" in
+		*' '-v*)
+			git show -s --show-signature FETCH_HEAD ;;
+		esac
+		;;
+	B)
+		echo >&2 "Bad signature on the tip commit"
+		exit 1
+		;;
+	*)
+		echo >&2 "Tip commit must be signed"
+		exit 1
+		;;
+	fi
+fi
+
 curr_head=$(git rev-parse -q --verify HEAD)
 if test -n "$orig_head" && test "$curr_head" != "$orig_head"
 then