diff --git a/ion/include/ion.h b/ion/include/ion.h
index dbfae79c1..ac327bbac 100644
--- a/ion/include/ion.h
+++ b/ion/include/ion.h
@@ -45,7 +45,7 @@ uint32_t random();
 // Decompress data
 void decompress(const uint8_t * src, uint8_t * dst, int srcSize, int dstSize);
 
-// Tells wether the stack pointer is within acceptable bounds
+// Tells whether the stack pointer is within acceptable bounds
 bool stackSafe();
 
 }