diff --git a/README.md b/README.md
index 01bcc0c..0f641ca 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@ doesn't support Alpine.
 | ----------------- | ------ | ---- | ------ | ------ | ------ |
 | bpftool           |  ✅    |  ✅  |  ✅    |  ✅    | ✅     |
 | cni-plugins       |        |  ✅  |  ✅    |  ✅    | ✅     |
-| docsify           |        |  ✅  |  ✅    |  ✅    | ✅     |
+| docsify           |        |  ?   |  ✅    |  ?     | ✅     |
 | go-ebpf           |        |  ✅  |  ✅    |  ✅    | ✅     |
 | go-mod-upgrade    |        |  ✅  |  ✅    |  ✅    | ✅     |
 | gocover           |        |  ✅  |  ✅    |  ✅    | ✅     |
diff --git a/TESTING.md b/TESTING.md
new file mode 100644
index 0000000..d57c5ec
--- /dev/null
+++ b/TESTING.md
@@ -0,0 +1,19 @@
+# Testing & Maintenance
+
+## Testing a DevContainer Feature
+
+To test a particular devcontainer feature, say, `lazygit`:
+
+```bash
+devcontainer features test -f lazygit -i mcr.microsoft.com/devcontainers/base:ubuntu-24.04 .
+```
+
+- `--skip-scenarios` ... tests only the `test.sh` test case, but no scenario tests.
+- `--filter alpine --skip-autogenerated` ... tests only the `alpine` scenario
+  (and neither `test.sh`).
+
+## Installing/Upgrading the DevContainer CLI
+
+```bash
+npm install -g @devcontainers/cli@latest
+```
diff --git a/src/gocover/devcontainer-feature.json b/src/gocover/devcontainer-feature.json
index 09b1721..da5c808 100644
--- a/src/gocover/devcontainer-feature.json
+++ b/src/gocover/devcontainer-feature.json
@@ -1,7 +1,7 @@
 {
     "name": "Go Coverage with Badge",
     "id": "gocover",
-    "version": "0.1.2",
+    "version": "0.1.3",
     "description": "runs Go unit tests with coverages, updating the README.md with a coverage badge.",
     "options": {
         "root": {
diff --git a/src/gocover/install.sh b/src/gocover/install.sh
index aba0198..6ebf242 100755
--- a/src/gocover/install.sh
+++ b/src/gocover/install.sh
@@ -82,6 +82,7 @@ trap 'rm -rf -- "\${GOCOVERTMPDIR}"' EXIT
 [[ "\${ROOT}" = "true" ]] && ROOT="-exec=sudo" || unset ROOT
 [[ "\${RACE}" = "true" ]] && RACE="-race" || unset RACE
 [[ "\${VERBOSE}" = "true" ]] && VERBOSE="-v" || unset VERBOSE
+[[ -n "\${TAGS}" ]] && TAGS="-tags=\${TAGS}" || unset TAGS
 
 [[ \${#POSARGS[@]} -eq 0 ]] && POSARGS+="./..."
 
@@ -91,6 +92,7 @@ if [[ -n "\${ROOT+x}" ]]; then
         \${VERBOSE} \
         \${RACE} \
         -count=\${COUNT} \${NUM_PROGRAMS} \
+        \${TAGS} \
         \${COVERPKG} \
         \${POSARGS[@]} -args -test.gocoverdir="\${GOCOVERTMPDIR}"
 fi
@@ -98,6 +100,7 @@ go test -cover \
     \${VERBOSE} \
     \${RACE} \
     -count=\${COUNT} \${NUM_PROGRAMS} \
+    \${TAGS} \
     \${COVERPKG} \
     \${POSARGS[@]} -args -test.gocoverdir="\${GOCOVERTMPDIR}"
 
diff --git a/test/docsify/port_5678.sh b/test/docsify/port_5678.sh
index 2a83c17..c28591a 100755
--- a/test/docsify/port_5678.sh
+++ b/test/docsify/port_5678.sh
@@ -13,6 +13,6 @@ EOF
 check "serves at port 5678" bash -c "${CMD}"
 
 check "serves live-reload at port 5679" bash -c \
-    "lsof -i :5679 -sTCP:LISTEN | awk 'NR>1 {print $1}' | grep -q 'node'"
+    "lsof -nP -iTCP:5679 -sTCP:LISTEN | awk 'NR>1 {print \$2}' | sort -u | (read PID && ps -p \$PID -o cmd= | grep -q 'node')"
 
 reportResults