diff --git a/test/api-visibility.ts b/test/api-visibility.ts
index 894d0d075..1e263bef5 100644
--- a/test/api-visibility.ts
+++ b/test/api-visibility.ts
@@ -2,10 +2,10 @@
  * Tests of API (visibility)
  *
  * How to run the tests:
- * > mocha test/api-visibility.ts --require ts-node/register
+ * > npx mocha test/api-visibility.ts --require ts-node/register
  *
  * To specify test:
- * > mocha test/api-visibility.ts --require ts-node/register -g 'test name'
+ * > npx mocha test/api-visibility.ts --require ts-node/register -g 'test name'
  *
  * If the tests not start, try set following enviroment variables:
  * TS_NODE_FILES=true and TS_NODE_TRANSPILE_ONLY=true
diff --git a/test/api.ts b/test/api.ts
index 343112b4a..5c22cd3c3 100644
--- a/test/api.ts
+++ b/test/api.ts
@@ -2,10 +2,10 @@
  * Tests of API
  *
  * How to run the tests:
- * > mocha test/api.ts --require ts-node/register
+ * > npx mocha test/api.ts --require ts-node/register
  *
  * To specify test:
- * > mocha test/api.ts --require ts-node/register -g 'test name'
+ * > npx mocha test/api.ts --require ts-node/register -g 'test name'
  *
  * If the tests not start, try set following enviroment variables:
  * TS_NODE_FILES=true and TS_NODE_TRANSPILE_ONLY=true
diff --git a/test/chart.ts b/test/chart.ts
index b3976b03b..28f34193f 100644
--- a/test/chart.ts
+++ b/test/chart.ts
@@ -2,10 +2,10 @@
  * Tests of chart engine
  *
  * How to run the tests:
- * > mocha test/chart.ts --require ts-node/register
+ * > npx mocha test/chart.ts --require ts-node/register
  *
  * To specify test:
- * > mocha test/chart.ts --require ts-node/register -g 'test name'
+ * > npx mocha test/chart.ts --require ts-node/register -g 'test name'
  *
  * If the tests not start, try set following enviroment variables:
  * TS_NODE_FILES=true and TS_NODE_TRANSPILE_ONLY=true
diff --git a/test/mfm.ts b/test/mfm.ts
index ccef31cd2..03d9f593a 100644
--- a/test/mfm.ts
+++ b/test/mfm.ts
@@ -2,10 +2,10 @@
  * Tests of MFM
  *
  * How to run the tests:
- * > mocha test/mfm.ts --require ts-node/register
+ * > npx mocha test/mfm.ts --require ts-node/register
  *
  * To specify test:
- * > mocha test/mfm.ts --require ts-node/register -g 'test name'
+ * > npx mocha test/mfm.ts --require ts-node/register -g 'test name'
  *
  * If the tests not start, try set following enviroment variables:
  * TS_NODE_FILES=true and TS_NODE_TRANSPILE_ONLY=true
diff --git a/test/mute.ts b/test/mute.ts
index bf24b55ee..07c77f762 100644
--- a/test/mute.ts
+++ b/test/mute.ts
@@ -2,10 +2,10 @@
  * Tests of mute
  *
  * How to run the tests:
- * > mocha test/mute.ts --require ts-node/register
+ * > npx mocha test/mute.ts --require ts-node/register
  *
  * To specify test:
- * > mocha test/mute.ts --require ts-node/register -g 'test name'
+ * > npx mocha test/mute.ts --require ts-node/register -g 'test name'
  *
  * If the tests not start, try set following enviroment variables:
  * TS_NODE_FILES=true and TS_NODE_TRANSPILE_ONLY=true
diff --git a/test/note.ts b/test/note.ts
index 45c016ca7..4a4a77734 100644
--- a/test/note.ts
+++ b/test/note.ts
@@ -2,10 +2,10 @@
  * Tests of Note
  *
  * How to run the tests:
- * > mocha test/note.ts --require ts-node/register
+ * > npx mocha test/note.ts --require ts-node/register
  *
  * To specify test:
- * > mocha test/note.ts --require ts-node/register -g 'test name'
+ * > npx mocha test/note.ts --require ts-node/register -g 'test name'
  *
  * If the tests not start, try set following enviroment variables:
  * TS_NODE_FILES=true and TS_NODE_TRANSPILE_ONLY=true
diff --git a/test/prelude/maybe.ts b/test/prelude/maybe.ts
index 470eec220..0fc7272a9 100644
--- a/test/prelude/maybe.ts
+++ b/test/prelude/maybe.ts
@@ -2,10 +2,10 @@
  * Tests of Maybe
  *
  * How to run the tests:
- * > mocha test/prelude/maybe.ts --require ts-node/register
+ * > npx mocha test/prelude/maybe.ts --require ts-node/register
  *
  * To specify test:
- * > mocha test/prelude/maybe.ts --require ts-node/register -g 'test name'
+ * > npx mocha test/prelude/maybe.ts --require ts-node/register -g 'test name'
  */
 
 import * as assert from 'assert';
diff --git a/test/reaction-lib.ts b/test/reaction-lib.ts
index 3a7ff1ab3..e52ec61b3 100644
--- a/test/reaction-lib.ts
+++ b/test/reaction-lib.ts
@@ -2,10 +2,10 @@
  * Tests of MFM
  *
  * How to run the tests:
- * > mocha test/reaction-lib.ts --require ts-node/register
+ * > npx mocha test/reaction-lib.ts --require ts-node/register
  *
  * To specify test:
- * > mocha test/reaction-lib.ts --require ts-node/register -g 'test name'
+ * > npx mocha test/reaction-lib.ts --require ts-node/register -g 'test name'
  *
  * If the tests not start, try set following enviroment variables:
  * TS_NODE_FILES=true and TS_NODE_TRANSPILE_ONLY=true
diff --git a/test/streaming.ts b/test/streaming.ts
index 11c63cd0f..1eb1b7ff4 100644
--- a/test/streaming.ts
+++ b/test/streaming.ts
@@ -2,10 +2,10 @@
  * Tests of streaming API
  *
  * How to run the tests:
- * > mocha test/streaming.ts --require ts-node/register
+ * > npx mocha test/streaming.ts --require ts-node/register
  *
  * To specify test:
- * > mocha test/streaming.ts --require ts-node/register -g 'test name'
+ * > npx mocha test/streaming.ts --require ts-node/register -g 'test name'
  *
  * If the tests not start, try set following enviroment variables:
  * TS_NODE_FILES=true and TS_NODE_TRANSPILE_ONLY=true
diff --git a/test/user-notes.ts b/test/user-notes.ts
index 5e457d669..63a97cd80 100644
--- a/test/user-notes.ts
+++ b/test/user-notes.ts
@@ -2,10 +2,10 @@
  * Tests of Note
  *
  * How to run the tests:
- * > mocha test/user-notes.ts --require ts-node/register
+ * > npx mocha test/user-notes.ts --require ts-node/register
  *
  * To specify test:
- * > mocha test/user-notes.ts --require ts-node/register -g 'test name'
+ * > npx mocha test/user-notes.ts --require ts-node/register -g 'test name'
  *
  * If the tests not start, try set following enviroment variables:
  * TS_NODE_FILES=true and TS_NODE_TRANSPILE_ONLY=true