diff --git a/ipynb/Bike Speed versus Grade.ipynb b/ipynb/Bike Speed versus Grade.ipynb
index 3454e23..6d36dcb 100644
--- a/ipynb/Bike Speed versus Grade.ipynb	
+++ b/ipynb/Bike Speed versus Grade.ipynb	
@@ -257,7 +257,7 @@
     "\n",
     "# VAM\n",
     "\n",
-    "The number of vertical feet climbed per hour (regardless of horizontal distance travelled) is known as [VAM](https://en.wikipedia.org/wiki/VAM_(bicycling)), which stands for *velocità ascensionale media* (when you have Campagnolo components) or *mean ascent velocity* (on SRAM) or 平均上昇率 (on Shimano). Legend has it that at grades between about 6% to 12%, most of your power is going into lifting against gravity, so your VAM should be about constant no matter what the grade in that range. (I guess that below that grade, power is spent on wind and rolling resistance, and above it, power goes largely to cursing *sotto voce*, as they say in Italian.) Here's a plot of VAM versus grades (in percent):"
+    "The number of vertical feet (or meters) climbed per hour (regardless of horizontal distance travelled) is known as [VAM](https://en.wikipedia.org/wiki/VAM_%28bicycling%29), which stands for *velocità ascensionale media* (for native Campagnolo speakers) or *mean ascent velocity* (for SRAM) or 平均上昇率 (for Shimano). Legend has it that at grades between about 6% to 12%, most of your power is going into lifting against gravity, so your VAM should be about constant no matter what the grade in that range. (I guess that below that grade, power is spent on wind and rolling resistance, and above it, power goes largely to cursing *sotto voce*, as they say in Italian.) Here's a plot of VAM versus grades (in percent):"
    ]
   },
   {