diff --git a/examples/baseline.rs b/examples/baseline.rs
index 4be8cd398d..f46b273d4b 100644
--- a/examples/baseline.rs
+++ b/examples/baseline.rs
@@ -45,7 +45,10 @@ const APP: () = {
         cx.spawn.foo().unwrap();
     }
 
+    // RTIC requires that unused interrupts are declared in an extern block when
+    // using software tasks; these free interrupts will be used to dispatch the
+    // software tasks.
     extern "C" {
-        fn UART1();
+        fn SSI0();
     }
 };
diff --git a/examples/capacity.rs b/examples/capacity.rs
index e50f929456..00cec34459 100644
--- a/examples/capacity.rs
+++ b/examples/capacity.rs
@@ -38,8 +38,10 @@ const APP: () = {
         debug::exit(debug::EXIT_SUCCESS);
     }
 
-    // Interrupt handlers used to dispatch software tasks
+    // RTIC requires that unused interrupts are declared in an extern block when
+    // using software tasks; these free interrupts will be used to dispatch the
+    // software tasks.
     extern "C" {
-        fn UART1();
+        fn SSI0();
     }
 };
diff --git a/examples/cfg.rs b/examples/cfg.rs
index 534c3f800d..02b39e349b 100644
--- a/examples/cfg.rs
+++ b/examples/cfg.rs
@@ -57,8 +57,11 @@ const APP: () = {
         .ok();
     }
 
+    // RTIC requires that unused interrupts are declared in an extern block when
+    // using software tasks; these free interrupts will be used to dispatch the
+    // software tasks.
     extern "C" {
-        fn UART0();
-        fn UART1();
+        fn SSI0();
+        fn QEI0();
     }
 };
diff --git a/examples/message.rs b/examples/message.rs
index 3fb2812141..596f244904 100644
--- a/examples/message.rs
+++ b/examples/message.rs
@@ -43,7 +43,10 @@ const APP: () = {
         c.spawn.foo().unwrap();
     }
 
+    // RTIC requires that unused interrupts are declared in an extern block when
+    // using software tasks; these free interrupts will be used to dispatch the
+    // software tasks.
     extern "C" {
-        fn UART0();
+        fn SSI0();
     }
 };
diff --git a/examples/not-send.rs b/examples/not-send.rs
index fc2196c23a..16a874dc0f 100644
--- a/examples/not-send.rs
+++ b/examples/not-send.rs
@@ -53,8 +53,11 @@ const APP: () = {
         debug::exit(debug::EXIT_SUCCESS);
     }
 
+    // RTIC requires that unused interrupts are declared in an extern block when
+    // using software tasks; these free interrupts will be used to dispatch the
+    // software tasks.
     extern "C" {
-        fn UART0();
-        fn UART1();
+        fn SSI0();
+        fn QEI0();
     }
 };
diff --git a/examples/not-sync.rs b/examples/not-sync.rs
index 57b18d7547..a7eaac8e7f 100644
--- a/examples/not-sync.rs
+++ b/examples/not-sync.rs
@@ -36,7 +36,10 @@ const APP: () = {
         let _: &NotSync = c.resources.shared;
     }
 
+    // RTIC requires that unused interrupts are declared in an extern block when
+    // using software tasks; these free interrupts will be used to dispatch the
+    // software tasks.
     extern "C" {
-        fn UART0();
+        fn SSI0();
     }
 };
diff --git a/examples/periodic.rs b/examples/periodic.rs
index f84744a291..405346e390 100644
--- a/examples/periodic.rs
+++ b/examples/periodic.rs
@@ -29,7 +29,10 @@ const APP: () = {
         cx.schedule.foo(cx.scheduled + PERIOD.cycles()).unwrap();
     }
 
+    // RTIC requires that unused interrupts are declared in an extern block when
+    // using software tasks; these free interrupts will be used to dispatch the
+    // software tasks.
     extern "C" {
-        fn UART0();
+        fn SSI0();
     }
 };
diff --git a/examples/pool.rs b/examples/pool.rs
index 38d2b6e19a..824d5bd86b 100644
--- a/examples/pool.rs
+++ b/examples/pool.rs
@@ -59,8 +59,11 @@ const APP: () = {
         // drop(x);
     }
 
+    // RTIC requires that unused interrupts are declared in an extern block when
+    // using software tasks; these free interrupts will be used to dispatch the
+    // software tasks.
     extern "C" {
-        fn UART0();
-        fn UART1();
+        fn SSI0();
+        fn QEI0();
     }
 };
diff --git a/examples/schedule.rs b/examples/schedule.rs
index 44a569397f..70a7a5e328 100644
--- a/examples/schedule.rs
+++ b/examples/schedule.rs
@@ -44,7 +44,10 @@ const APP: () = {
         hprintln!("bar  @ {:?}", Instant::now()).unwrap();
     }
 
+    // RTIC requires that unused interrupts are declared in an extern block when
+    // using software tasks; these free interrupts will be used to dispatch the
+    // software tasks.
     extern "C" {
-        fn UART0();
+        fn SSI0();
     }
 };
diff --git a/examples/t-cfg.rs b/examples/t-cfg.rs
index feb7114488..52e6d1c9d3 100644
--- a/examples/t-cfg.rs
+++ b/examples/t-cfg.rs
@@ -43,8 +43,11 @@ const APP: () = {
     #[task]
     fn quux(_: quux::Context) {}
 
+    // RTIC requires that unused interrupts are declared in an extern block when
+    // using software tasks; these free interrupts will be used to dispatch the
+    // software tasks.
     extern "C" {
-        fn UART0();
-        fn UART1();
+        fn SSI0();
+        fn QEI0();
     }
 };
diff --git a/examples/t-schedule.rs b/examples/t-schedule.rs
index 67fcb749ea..4a23182273 100644
--- a/examples/t-schedule.rs
+++ b/examples/t-schedule.rs
@@ -53,7 +53,10 @@ const APP: () = {
     #[task]
     fn baz(_: baz::Context, _x: u32, _y: u32) {}
 
+    // RTIC requires that unused interrupts are declared in an extern block when
+    // using software tasks; these free interrupts will be used to dispatch the
+    // software tasks.
     extern "C" {
-        fn UART1();
+        fn SSI0();
     }
 };
diff --git a/examples/t-spawn.rs b/examples/t-spawn.rs
index 4fc1f4e3f0..2d941b1567 100644
--- a/examples/t-spawn.rs
+++ b/examples/t-spawn.rs
@@ -52,7 +52,10 @@ const APP: () = {
     #[task]
     fn baz(_: baz::Context, _x: u32, _y: u32) {}
 
+    // RTIC requires that unused interrupts are declared in an extern block when
+    // using software tasks; these free interrupts will be used to dispatch the
+    // software tasks.
     extern "C" {
-        fn UART1();
+        fn SSI0();
     }
 };
diff --git a/examples/t-stask-main.rs b/examples/t-stask-main.rs
index 4245ef22f6..f270940454 100644
--- a/examples/t-stask-main.rs
+++ b/examples/t-stask-main.rs
@@ -18,7 +18,10 @@ const APP: () = {
         debug::exit(debug::EXIT_SUCCESS);
     }
 
+    // RTIC requires that unused interrupts are declared in an extern block when
+    // using software tasks; these free interrupts will be used to dispatch the
+    // software tasks.
     extern "C" {
-        fn UART0();
+        fn SSI0();
     }
 };
diff --git a/examples/task.rs b/examples/task.rs
index 10a4dc73bd..12c4ac8355 100644
--- a/examples/task.rs
+++ b/examples/task.rs
@@ -45,9 +45,11 @@ const APP: () = {
         hprintln!("baz").unwrap();
     }
 
-    // Interrupt handlers used to dispatch software tasks
+    // RTIC requires that unused interrupts are declared in an extern block when
+    // using software tasks; these free interrupts will be used to dispatch the
+    // software tasks.
     extern "C" {
-        fn UART0();
-        fn UART1();
+        fn SSI0();
+        fn QEI0();
     }
 };
diff --git a/examples/types.rs b/examples/types.rs
index 29dedaffa8..e14ab0c811 100644
--- a/examples/types.rs
+++ b/examples/types.rs
@@ -52,7 +52,10 @@ const APP: () = {
         let _: foo::Spawn = cx.spawn;
     }
 
+    // RTIC requires that unused interrupts are declared in an extern block when
+    // using software tasks; these free interrupts will be used to dispatch the
+    // software tasks.
     extern "C" {
-        fn UART1();
+        fn SSI0();
     }
 };