diff --git a/nag b/nag
index 8a23166..7beb320 100755
--- a/nag
+++ b/nag
@@ -1252,5 +1252,39 @@ every() {
   printf "[%s] %s (%s) — %s\\n" "${_id}" "${_human_time}" "${_rules_str//,/, }" "${_message}"
 }
 
+# mute ########################################################################
+
+describe "mute" <<HEREDOC
+Usage:
+  ${_ME} mute
+
+Description:
+  Mute alarm sounds. Notifications still fire, but no sound is played.
+HEREDOC
+mute() {
+  _ensure_nag_dir
+  : > "${_MUTED_FILE}"
+  printf "Sound muted.\\n"
+}
+
+# unmute ######################################################################
+
+describe "unmute" <<HEREDOC
+Usage:
+  ${_ME} unmute
+
+Description:
+  Unmute alarm sounds.
+HEREDOC
+unmute() {
+  if [[ -f "${_MUTED_FILE}" ]]
+  then
+    rm -f "${_MUTED_FILE}"
+    printf "Sound unmuted.\\n"
+  else
+    printf "Sound is not muted.\\n"
+  fi
+}
+
 # _main must be called after everything has been defined.
 _main
diff --git a/test/nag.bats b/test/nag.bats
index c166a56..348a5e8 100644
--- a/test/nag.bats
+++ b/test/nag.bats
@@ -304,3 +304,26 @@ SCRIPT
   [[ "${output}" =~ "Usage:" ]]
   [[ "${output}" =~ "check" ]]
 }
+
+# mute/unmute #################################################################
+
+@test "mute creates muted file" {
+  run_nag mute
+  [ "${status}" -eq 0 ]
+  [[ "${output}" =~ "muted" ]]
+  [ -f "${NAG_DIR}/muted" ]
+}
+
+@test "unmute removes muted file" {
+  run_nag mute
+  run_nag unmute
+  [ "${status}" -eq 0 ]
+  [[ "${output}" =~ "unmuted" ]]
+  [ ! -f "${NAG_DIR}/muted" ]
+}
+
+@test "unmute when not muted says so" {
+  run_nag unmute
+  [ "${status}" -eq 0 ]
+  [[ "${output}" =~ "not muted" ]]
+}