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-rw-r--r--docs/gpio_control.md2
1 files changed, 1 insertions, 1 deletions
diff --git a/docs/gpio_control.md b/docs/gpio_control.md
index e1f1515b71..12413dfc8e 100644
--- a/docs/gpio_control.md
+++ b/docs/gpio_control.md
@@ -30,7 +30,7 @@ The above functions are not always guaranteed to work atomically. Therefore, if
eg.
```c
-void some_function() {
+void some_function(void) {
// some process
ATOMIC_BLOCK_FORCEON {
// Atomic Processing