diff --git a/README.md b/README.md
index e211dc3..5d0e6ad 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,7 @@ I add my Pi Pico (RP2040) stuff here. There are complete [apps](/apps) and [libr
 - [Iperf Server](/apps/iperf_server): A tool to measure the performance of the TinyUSB's TCP/IP stack over USB.
 - [TCP Server](/apps/tcp_server): A TCP server example to send high-frequency data to the host computer.
 - [Filesystem](/apps/filesystem): A simple non-volatile filesystem based on LittleFS. It uses the internal flash.
-- [Altimeter](/apps/filesystem): A simple altimeter for rockets, kites, balloons, etc.
+- [Altimeter](/apps/altimeter): A simple altimeter for rockets, kites, balloons, etc.
 
 ## Installation
 Some projects may require a patched version of the `pico-sdk` or `pico-extras`.
diff --git a/apps/README.md b/apps/README.md
index a3c113b..48ce567 100644
--- a/apps/README.md
+++ b/apps/README.md
@@ -7,4 +7,4 @@ These are sample applications with various purposes.
 - [Iperf Server](/apps/iperf_server): A tool to measure the performance of the TinyUSB's TCP/IP stack over USB.
 - [TCP Server](/apps/tcp_server): A TCP server example to send high-frequency data to the host computer.
 - [Filesystem](/apps/filesystem): A simple non-volatile filesystem based on LittleFS. It uses the internal flash.
-- [Altimeter](/apps/filesystem): A simple altimeter for rockets, kites, balloons, etc.
\ No newline at end of file
+- [Altimeter](/apps/altimeter): A simple altimeter for rockets, kites, balloons, etc.
\ No newline at end of file