diff --git a/doc/en/Authoring/GeoGebra.md b/doc/en/Authoring/GeoGebra.md
index 5965ae1131e97288f782c948e8bd67de40fcf03a..323300ff0f3aa657d0414161ba51dbc9ca5b2576 100644
--- a/doc/en/Authoring/GeoGebra.md
+++ b/doc/en/Authoring/GeoGebra.md
@@ -126,7 +126,7 @@ Recall that since the object in `watch="A"` is written in upper case it must be
 
 Then complete the question as follows.
 
-1. The question expects an in input `A`.  In this input, make the model answer `ta1`.  This is a list, and has a different name from the watched point..
+1. The question expects an input `A`.  In this input, make the model answer `ta1`.  This is a list, and has a different name from the watched point..
 2. Make sure you set "forbid floats" option in the input to be false, if you want to!
 3. Complete the default potential response tree `prt1` as `ATAlgEquiv(ntupleify(A), ntupleify(ta1))`