diff --git a/README b/README
index 89303a7..b882320 100644
--- a/README
+++ b/README
@@ -21,7 +21,7 @@ Pins 22-29 (Port A) are used by default.
 To use this with the original or alternative SUMP clients,
 use these settings:
 
-Sampling rate: 4MHz (or lower)
+Sampling rate: 4MHz (or lower) (no 2MHz on ATmega168)
 Channel Groups: 0 (zero) only
 Recording Size:
    ATmega168:  532 (or lower)
diff --git a/logic_analyzer.ino b/logic_analyzer.ino
index 515afd4..4818d3c 100644
--- a/logic_analyzer.ino
+++ b/logic_analyzer.ino
@@ -47,7 +47,7 @@
  * To use this with the original or alternative SUMP clients,
  * use these settings:
  * 
- * Sampling rate: 4MHz (or lower)
+ * Sampling rate: 4MHz (or lower) (no 2MHz on ATmega168)
  * Channel Groups: 0 (zero) only
  * Recording Size:
  *    ATmega168:  532 (or lower)
@@ -299,7 +299,9 @@ void loop()
       } 
       else if (divider == 49) {
         /* 2.0MHz */
+#if defined(__AVR_ATmega168P__)
         captureInline2mhz();
+#endif
       } 
       else if (useMicro) {
         if (trigger && (delayTime != 1)) {