diff --git a/magick/effect.c b/magick/effect.c
index 6c66d3d..451d204 100644
--- a/magick/effect.c
+++ b/magick/effect.c
@@ -3066,7 +3066,7 @@
 %
 %    o sigma: the standard deviation of the Gaussian, in pixels.
 %
-%    o angle: Apply the effect assize_t this angle.
+%    o angle: Apply the effect along this angle.
 %
 %    o exception: return any errors or warnings in this structure.
 %