diff --git a/docs/lib3x-sf_solidify.md b/docs/lib3x-sf_solidify.md
index 0ba2c3df..dc718476 100644
--- a/docs/lib3x-sf_solidify.md
+++ b/docs/lib3x-sf_solidify.md
@@ -1,6 +1,6 @@
 # sf_solidify
 
-It solidifies two square surfaces, described as a m * n list of `[x, y, z]`s. 
+It solidifies two square surfaces, described by a m * n list of `[x, y, z]`s. 
 
 **Since:** 2.3