diff --git a/doc/stereo.html b/doc/stereo.html
index 752abfc83..14f831c32 100644
--- a/doc/stereo.html
+++ b/doc/stereo.html
@@ -120,7 +120,7 @@ The environmental variables of interest:</h3>
 </tr>
 
 <tr>
-<td><b>OSG_EYE_SEPERATION</b></td>
+<td><b>OSG_EYE_SEPARATION</b></td>
 
 <td><b>0.06</b></td>
 
@@ -128,7 +128,7 @@ The environmental variables of interest:</h3>
 </tr>
 
 <tr>
-<td><b>OSG_SPLIT_STEREO_HORIZONTAL_SEPERATION</b></td>
+<td><b>OSG_SPLIT_STEREO_HORIZONTAL_SEPARATION</b></td>
 
 <td><b>42</b></td>
 
@@ -154,7 +154,7 @@ shown).</td>
 </tr>
 
 <tr>
-<td><b>OSG_SPLIT_STEREO_VERTICAL_SEPERATION</b></td>
+<td><b>OSG_SPLIT_STEREO_VERTICAL_SEPARATION</b></td>
 
 <td><b>42</b></td>