@@ -271,6 +271,17 @@ or you are unsure what this means choose another name with the '--name' option."
 	fi &&
 	git add --force .gitmodules ||
 	die "$(eval_gettext "Failed to register submodule '\$sm_path'")"
+
+	if git config --get submodule.active >/dev/null
+	then
+		# If the submodule being adding isn't already covered by the
+		# current configured pathspec, add the submodule's path to
+		# 'submodule.active'
+		if ! git submodule--helper is-active "$sm_path"
+		then
+			git config --add submodule.active "$sm_path"
+		fi
+	fi
 }
 
 #

@@ -60,4 +60,26 @@ test_expect_success 'is-active works with exclusions in submodule.active config'
 	git -C super config --unset-all submodule.active
 '
 
+test_expect_success 'is-active and submodule add' '
+	test_when_finished "rm -rf super2" &&
+	git init super2 &&
+	test_commit -C super2 initial &&
+	git -C super2 config --add submodule.active "sub*" &&
+
+	cat >expect <<-\EOF &&
+	sub*
+	EOF
+	git -C super2 submodule add ../sub sub1 &&
+	git -C super2 config --get-all submodule.active >actual &&
+	test_cmp actual expect &&
+
+	cat >expect <<-\EOF &&
+	sub*
+	mod
+	EOF
+	git -C super2 submodule add ../sub mod &&
+	git -C super2 config --get-all submodule.active >actual &&
+	test_cmp actual expect
+'
+
 test_done