gnuradio.md

@@ -219,7 +219,7 @@ We list some of the most useful counters in the following table.
 | `pc_throughput_avg()`   | Gets average throughput.                  |
 | `reset_perf_counters()` | Resets the performance counters.          |
 
-As an example, if you wished to know how efficiency your block was implemented,
+As an example, if you wished to know how efficiently your block was implemented,
 you could look at the ratio of the average number of items produced to
 average time spent producing those items.