diff --git a/examples/platforms/nrf52811/DIAG.md b/examples/platforms/nrf52811/DIAG.md
index bb38e7655..b2e7bc56d 100644
--- a/examples/platforms/nrf52811/DIAG.md
+++ b/examples/platforms/nrf52811/DIAG.md
@@ -151,4 +151,4 @@ Start transmiting messages with specified interval.
 ### diag transmit carrier
 Start transmitting continuous carrier wave.
 
-[DIAG]: ./../../../src/diag/README.md
+[DIAG]: ./../../../src/core/diags/README.md
diff --git a/examples/platforms/nrf52811/README.md b/examples/platforms/nrf52811/README.md
index 2b6aa8f24..046b9875b 100644
--- a/examples/platforms/nrf52811/README.md
+++ b/examples/platforms/nrf52811/README.md
@@ -349,7 +349,7 @@ nRF52811 supports [OpenThread Diagnostics Module][DIAG], with some additional fe
 
 For more information, see [nRF Diag command reference][nRFDIAG].
 
-[DIAG]: ./../../../src/diag/README.md
+[DIAG]: ./../../../src/core/diags/README.md
 [nRFDIAG]: DIAG.md
 
 ## Radio driver documentation
diff --git a/examples/platforms/nrf52840/DIAG.md b/examples/platforms/nrf52840/DIAG.md
index cd5da367b..345abacaa 100644
--- a/examples/platforms/nrf52840/DIAG.md
+++ b/examples/platforms/nrf52840/DIAG.md
@@ -151,4 +151,4 @@ Start transmiting messages with specified interval.
 ### diag transmit carrier
 Start transmitting continuous carrier wave.
 
-[DIAG]: ./../../../src/diag/README.md
+[DIAG]: ./../../../src/core/diags/README.md
diff --git a/examples/platforms/nrf52840/README.md b/examples/platforms/nrf52840/README.md
index c9c541be8..8b71dc00e 100644
--- a/examples/platforms/nrf52840/README.md
+++ b/examples/platforms/nrf52840/README.md
@@ -379,7 +379,7 @@ nRF52840 port extends [OpenThread Diagnostics Module][DIAG].
 
 You can read about all the features [here][nRFDIAG].
 
-[DIAG]: ./../../../src/diag/README.md
+[DIAG]: ./../../../src/core/diags/README.md
 [nRFDIAG]: DIAG.md
 
 ## Radio driver documentation
diff --git a/src/cli/README.md b/src/cli/README.md
index 03f4d8c4f..7b308c1ef 100644
--- a/src/cli/README.md
+++ b/src/cli/README.md
@@ -1501,7 +1501,7 @@ Done
 ### diag
 
 Factory Diagnostics module is enabled only when building OpenThread with `OPENTHREAD_CONFIG_DIAG_ENABLE=1` option.
-Go [diagnostics module][1] for more information.
+Go [diagnostics module][DIAG] for more information.
 
 ### service
 
@@ -1534,4 +1534,4 @@ Remove service from Network Data.
 Done
 ```
 
-[1]:../diag/README.md
+[DIAG]:../../src/core/diags/README.md
diff --git a/src/posix/README.md b/src/posix/README.md
index 90d93fd80..7f9913bf6 100644
--- a/src/posix/README.md
+++ b/src/posix/README.md
@@ -31,7 +31,7 @@ Test
 ----
 
 **NOTE** Assuming the build system is 64bit Linux, you can use the normal OpenThread CLI as described in the [command line document](../../src/cli/README.md).
-You can also perform radio diagnostics using the command [diag](../../src/diag/README.md).
+You can also perform radio diagnostics using the command [diag](../../src/core/diags/README.md).
 
 ### With Simulation